Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 7182836 | Method for delignifying lignocellulosic raw materials The invention relates to a method for delignifying lignocellulosic raw materials by using sulfites in the presence of an alkaline component, especially sodium hydroxide or sodium carbonate or a mixture thereof in an aqueous solution at a high temperature and high pr... | 02/27/2007 |
| 7081183 | Method of deresinating pulp using alkyl alcohol alkoxylate surfactants This invention is a method of reducing the resin content of chemical pulps comprising heating wood chips in an aqueous alkaline medium in the presence of an effective deresinating amount of an alkyl alcohol alkoxylate of formula RO[(CH2CHCH3O) | 07/25/2006 |
| 6923887 | Method for hydrogen peroxide bleaching of pulp using an organic solvent in the bleaching medium Disclosed is a method for pulp bleaching. The method comprises the steps of providing a pulp sample for bleaching, the pulp sample stemming from a pulp producing process, providing a bleaching liquor comprising water and an organic component as solvent components co... | 08/02/2005 |
| 6770168 | Process for oxygen pulping of lignocellulosic material and recorvery of pulping chemicals A substantially sulfur free process for the manufacturing of a chemical pulp with an integrated recovery system for recovery of pulping chemicals is carried out on in several stages involving physical and chemical treatment of lignocellulosic material in order to in... | 08/03/2004 |
| 6740199 | Process for digesting woodchips with a sultaine and a polyglycoside The invention relates to a process for digesting woodchips used in papermaking. The process employs digester additive, which comprises a sultaine or mixtures of a sultaine with a nonionic surfactant selected from the group consisting of (a) polyglycosides, (b) polyo... | 05/25/2004 |
| 6719880 | Process for producing paper and absorbent products of increased strength A process for producing paper and absorbent products of increased strength includes extracting wood particulates with a solvent selected from methanol, ethanol, and acetone at a pressure less than 50 psi to reduce the pitch and volatile organic compounds of the part... | 04/13/2004 |
| 6706144 | Method of dewatering pulp A method of dewatering an aqueous cellulosic pulp slurry comprising adding to an aqueous slurry of washed cellulosic pulp an effective dewatering amount of a mixture of one or more nonionic surfactants and one or more anionic surfactants. ... | 03/16/2004 |
| 6649023 | Process for digesting woodchips and digester additives The invention relates to a process for digesting woodchips used in papermaking. The process employs a digester additive, which is a mixture of (a) a polyglycoside, and (b) a polyoxyalkylene glycol. The digester additives are compatible and stable at eleva... | 11/18/2003 |
| 6641699 | Chemical wood pulping process with reduced pitch and VOC emissions A chemical wood pulping process having reduced volatile organic compound emissions includes extracting wood particulates with solvent at a pressure less than 50 psi to reduce naturally-occurring particulate pitch and volatile organic compound content with... | 11/04/2003 |
| 6599326 | Inhibition of pulp and paper yellowing using hydroxylamines and other coadditives Chemical pulps or papers, especially kraft pulps or papers, which may still contain traces of lignin, have enhanced resistance to yellowing when they contain an effective stabilizing amount of a N,N-dialkylhydroxylamine, an ester, amide or thio substitute... | 07/29/2003 |
| 6596908 | Process for the recovery of low molecular weight phenols, furfural, furfuryl alcohol and/or cellulose or cellulose-rich residues A process for the recovery of furfural, furfuryl alcohol, low molecular weight phenols and/or cellulose or a cellulose-rich material from a lignocellulosic material comprising: feeding a carrier gas into a reaction chamber to facilitate a fluidised bed ef... | 07/22/2003 |
| 6551452 | Process for digesting woodchips and digester additives The invention relates to a process for digesting woodchips used in papermaking. The process employs a digester additive, which is a mixture of (a) a polyglycoside, and (b) a polyoxyalkylene glycol. The digester additives are compatible and stable at eleva... | 04/22/2003 |
| 6524435 | Method and composition for dispersing hydrophobic particles in aqueous suspensions A method of dispersing hydrophobic particles in aqueous suspensions comprising adding to the suspension an effective amount of an ethylene oxide-propylene oxide block copolymer, wherein the copolymer has a molecular weight of from about 1,000 to about 50,... | 02/25/2003 |
| 6500303 | Inhibition of pulp and paper yellowing using nitroxides, hydroxylamines and other coadditives Pulps or papers, especially chemimechanical or thermomechanical pulps or papers, which still contain lignin, have enhanced resistance to yellowing when they contain an effective stabilizing amount of a hindered amine compound which preferably is a nitroxi... | 12/31/2002 |
| 6447644 | Inhibition of pulp and paper yellowing using nitroxides, hydroxylamines and other coadditives Pulps or papers, especially chemimechanical or thermomechanical pulps or papers, which still contain lignin, have enhanced resistance to yellowing when they contain an effective stabilizing amount of a hindered amine compound which preferably is a nitroxi... | 09/10/2002 |
| 6432262 | Method of bleaching recycled papers with hydrogen peroxide stabilized with a methylolhydantoin A method of stabilizing hydrogen peroxide in an aqueous solution, such as a circulating water slurry, comprising a peroxide, such as hydrogen peroxide. The aqueous solution may include organic matter. The method comprises adding an aldehyde donor, such as... | 08/13/2002 |
| 6364999 | Process for producing a wood pulp having reduced pitch content and process and reduced VOC-emissions Paper and absorbent products having reduced pitch content and enhanced properties, including increased tensile index, tear index, burst index, Scott Bond, smoothness, and stiffness. Further, pulps of the invention, although having slightly reduced brightn... | 04/02/2002 |
| 6254724 | Inhibition of pulp and paper yellowing using nitroxides, hydroxylamines and other coadditives Pulps or papers, especially chemimechanical or thermomechanical pulps or papers, which still contain lignin, have enhanced resistance to yellowing when they contain an effective stabilizing amount of a hindered amine compound which preferably is a nitroxi... | 07/03/2001 |
| 6217711 | Method of treating condensates A method of treating cellulose pulp mill condensates having an MeOH content using an evaporator and a steam stripper having a reboiler, comprising: (a) Collecting a feed liquor stream having at least 50% of the pulp mill MeOH. (b) Feeding the feed liquor ... | 04/17/2001 |
| 5914004 | Method of producing pulp for paper manufacture The present invention is related to a method of producing paper pulp from a fibrous raw material. According to the invention, such pulpwood is used in which the content of phenol compounds or phenolic derivatives is clearly, advantageously at least 20% lo... | 06/22/1999 |
| 5876559 | Deinking of impact and non-impact printed paper by an agglomeration process Deinking of impact and nonimpact printed paper is accomplished by repulping the printed paper in an alkali aqueous medium containing a deinking composition comprising one or more nonionic surfactants and/or alkanols. The presence of the deinking compositi... | 03/02/1999 |
| 5871614 | Process for reducing anthraquinone requirements in pulping of lignocellulosic material An improved process for delignification of lignocellulosic raw material, such as wood chips, for the production of cellulose pulps for use in the manufacture of paper or paperboard and an improved pulping aid composition for use in said process are disclo... | 02/16/1999 |
| 5865948 | Method for steaming comminuted cellulosic fibrous material during continuous solvent pulping A continuous solvent pulping process is practiced with oxygen free gas (e.g. nitrogen) purges of all major treatment vessels during the time when the process is arrested or terminated. The wood chips or other cellulosic fibrous material to be pulped is st... | 02/02/1999 |
| 5788812 | Method of recovering furfural from organic pulping liquor This invention provides for the recovery of lignin and other by-products from the pulping of fibrous plant material. In accordance with this invention, solvents and filtrates are recovered and recycled for reuse. This results in significant solvent and en... | 08/04/1998 |
| 5730837 | Method of separating lignocellulosic material into lignin, cellulose and dissolved sugars A method for separating lignocellulosic material into (a) lignin, (b) cellulose, and (c) hemicellulose and dissolved sugars. Wood or herbaceous biomass is digested at elevated temperature in a single-phase mixture of alcohol, water and a water-immiscible ... | 03/24/1998 |
| 5685953 | Ozone bleaching with an organic solvent and mineral acid A bleached pulp having a high viscosity for a given permanganate number is formed by pretreating never dried pulp with an organic solvent medium to produce a treated pulp composed of said never dried pulp in the medium and then bleaching that treated pulp... | 11/11/1997 |
| 5681427 | Apparatus for treating pulp produced by solvent pulping An apparatus and process for the solvent pulping and washing of pulp using vessels purged of oxygen free gas when the process is arrested or terminated. The washing is accomplished by first continuously passing the pulp to a pressure diffuser, then to a f... | 10/28/1997 |
| 5672244 | High temperature deinking method using an alkylene oxide adduct In the deinking of feed waste papers comprising magazines and newspapers at a weight ratio of magazine to newspaper of from 5/95 to 60/40, a reclaimed pulp with excellent qualities can be obtained by adjusting the treating temperature in the flotation ste... | 09/30/1997 |
| 5632860 | Method of controlling foam in aqueous systems A method for controlling foam in the papermaking operation comprising a polyether surfactant and polyethoxylated sorbitol hexaoleate.... | 05/27/1997 |
| 5609723 | Oxygen bleaching process for cellulocis pulps with a polyhydric alcohol cellulose protector An improved oxygen bleaching process wherein the pulp is bleached in an aqueous organic medium wherein a polyhydric alcohol constitutes between 10 and 70% by weight of the medium to produce a pulp having a viscosity at least 2.5 cp higher than a similar p... | 03/11/1997 |
| 5607544 | Process and agent for the oxidative bleaching of wood pulp and for deinking waste paper The present invention provides a process for the oxidative bleaching of wood pulps and for deinking waste paper by means of hydrogen peroxide and a stabilizing agent, wherein, as stabilizing agent, there is used 2-oxo-2-(4-hydroxyphenyl)-acethydroximic ac... | 03/04/1997 |
| 5575893 | Felt conditioner for deinked recycled newsprint papermaking system A method for conditioning the felts in a papermaking process utilizing deinked secondary fiber in the furnish by adding a felt conditioner consisting of from 5-33% of a nonionic surfactant, from 5-33% of a dispersant, or blends thereof, with the remainder... | 11/19/1996 |
| 5562862 | Polybutene-based foam control composition for aqueous systems A stable defoamer composition and method of defoaming an aqueous system is disclosed. The composition comprises an alcohol alkoxylate, at least one surfactant having a melting point less than 20° C., and a low HLB, ethylene oxide/propylene oxide block co... | 10/08/1996 |
| 5527427 | High solids black liquor of reduced viscosity and viscosity reduction method for high solids black liquor A high solids black liquor which has solids content of at least 65% by weight of liquor is mixed with a viscosity reducing additive prior to firing in a chemical recovery furnace. The additive is an admixed compound consisting of monoethylene glycol, diet... | 06/18/1996 |
| 5507913 | Solvent recovery in pulp bleaching with ozone A process for bleaching pulp by impregnating the pulp with an aqueous organic solvent medium and then bleaching in an ozone stage (Z stage) to form a bleached pulp characterized in that organic solvent in the organic solvent medium accompanying the pulp t... | 04/16/1996 |
| 5500082 | Deinking of xerographic printed wastepaper using long chain alcohol Disclosed is a method of removing ink from xerographically printed paper. The method comprises pulping said printed paper in an aqueous slurry at a non-acidic pH to a consistency of about 8% or less. Next, added to the pulp slurry is a sufficient amount o... | 03/19/1996 |
| 5470433 | Process for the delignification of cellulose fiber raw materials using alcohol and alkali A process for the delignification of cellulose fiber plant raw material for the production of pulp using separate impregnating and delignifying stages, each using alcohol and alkali. The process may be carried out in batch or in a continuous process. Less... | 11/28/1995 |
| 5405498 | Method for improving pulp washing efficiency A process for enhancing pulp washing efficiency is disclosed. An anionic surfactant is added within the washing or pulping operation to enhance the removal of lignin and spent cooking chemicals from pulp.... | 04/11/1995 |
| 5342483 | Process for deinking paper using water-soluble alcohols A process for deinking wastepaper by combining a water-miscible organic solvent with inked paper to create a solvent/paper slurry, agitating the solvent/paper slurry to assist in releasing ink from the paper, separating the ink-ladden solvent from the pap... | 08/30/1994 |
| 5338405 | Production of fiber pulp by impregnating the lignocellulosic material with an aqueous alcoholic SO2 solution prior to defibration In a process for manufacturing chemo-mechanical and/or chemothermal-mechanical wood pulps, raw materials containing lignocellulose, such as wood shavings, wood chips, pre-ground wood or sawdust, are first impregnated with an aqueous alcoholic SO2 | 08/16/1994 |
