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 |
| 6656885 | Anhydride-modified chitosan, method of preparation thereof, and fluids containing same The invention provides an organic diacid anhydride-modified chitosan containing a polar additive comprising water soluble compounds containing one or more hydroxyl groups or one or more amino groups, including compounds containing both hydroxyl and amine ... | 12/02/2003 |
| 6358889 | Viscosified aqueous chitosan-containing well drilling and servicing fluids The invention provides well drilling and servicing fluids comprising an alkaline aqueous liquid containing chitosan, an anhydride, and an aldehyde therein. The invention further provides a method of drilling a well wherein there is circulated in the wellb... | 03/19/2002 |
| 6291404 | Viscosified aqueous chitosan-containing well drilling and servicing fluids The invention provides aqueous viscous or gelled alkaline fluids particularly useful in oil and gas well operations, and a method of drilling a well therewith. The fluids contain chitosan, an amine reactive acid, and an aldehyde therein, whereby the amine... | 09/18/2001 |
| 6277792 | Viscosified aqueous fluids and viscosifier therefor The present invention discloses a method of producing modified, derivatized chitosans which produce viscous aqueous liquids when dispersed (solublized) in compatible aqueous liquids. The method comprises reacting chitosan in an acidic solution with an ald... | 08/21/2001 |
| 6258755 | Chitosan-containing well drilling and servicing fluids Disclosed are a process for the preparation of pseudoplastic, shear thinning chitosan-containing fluids, and a method of enhancing the thermal stability of such fluids. Pseudoplastic fluids useful oil and/or gas wells, particularly drilling fluids, drill-... | 07/10/2001 |
| 5916849 | Polysaccharide-containing well drilling and servicing fluids Disclosed is a method of increasing the thermal stability or decreasing the fluid loss of aqueous polysaccharide-containing fluids which comprises incorporating into the fluids an oligosaccharide mixture composed of arabinose, mannose, galactose, glucose,... | 06/29/1999 |
| 5230305 | Scoopable cat litter and method An improvement in the use of clumping, scoopable litter to sorb and remove the urine deposited in litter receptacles by utilizing as the litter a natural product which has been modified to render it cohesive when wetted with urine. The modified natural pr... | 07/27/1993 |
| 5207830 | Lightweight particulate cementitious materials and process for producing same Disclosed is a process of manufacturing a lightweight particulate cementitious composition particularly adapted to the sorption of liquids comprising adding to a foamed cement slurry a particle forming agent, and aging the treated foamed slurry for a peri... | 05/04/1993 |
| 5188064 | Clumping cat litter The invention provides a method of increasing the sorption capacity of smectite clays which exhibit osmotic swelling such as montmorillonite clays having predominately sodium as the exchangeable cation. The invention further provides a clumping cat litter... | 02/23/1993 |
| 5147852 | Reduction of seepage losses in well working compositions The invention provides well working compositions containing a particulate additive to decrease the seepage loss of the fluid to fluid permeable formations contacted by the compositions. The additive comprises: (1) a cellulosic material selected from the g... | 09/15/1992 |
| 5076944 | Seepage loss reducing additive for well working compositions and uses thereof The invention provides well working fluid compositions containing cotton burrs ground to certain particle size ranges to decrease the seepage loss of the fluid to fluid permeable formations contacted by the compositions. Also provided is a seepage loss ad... | 12/31/1991 |
| 5071575 | Well working compositions, method of decreasing the seepage loss from such compositions, and additive therefor The invention provides well working fluid compositions containing oat hulls ground to certain particle size ranges to decrease the seepage loss of the fluid to fluid permeable formations contacted by the compositions. Also provided is a seepage loss addit... | 12/10/1991 |
| 5004553 | Well working compositions, method of decreasing the seepage loss from such compositions, and additive therefor The invention provides well working fluid compositions containing oat hulls ground to certain particle size ranges to decrease the seepage loss of the fluid to fluid permeable formations contacted by the compositions. Also provided is a seepage loss addit... | 04/02/1991 |
| 4925616 | Method of protecting a cased pipeline from corrosion Tall oil pitch is used as casing fillers in the interstitial spaced between a pipeline and a surrounding casing pipe. The tall oil pitch can be used per se or can be modified by: increasing its specific gravity above 1.0; increasing its pour point or drop... | 05/15/1990 |
| 4843048 | Organophilic clay compositions Organophilic clays which are effective fluid loss control additives for oil base well-working fluids are prepared from a swelling smectite clay and one or more phosphatides. Preferred phosphatides are phosphoglycerides obtained from vegetable oils, most p... | 06/27/1989 |
| 4597878 | Polyphenolic acid adducts The invention provides novel humic acid derivatives obtained by reacting humic acid-containing materials with a noval amide mixture comprising a polyamide and an amido-amine containing one free amino group per molecule. The novel amide mixture is obtained... | 07/01/1986 |
| 4569799 | Process for making organophilic humate derivatives The invention provides a novel process of preparing organophilic humate derivatives wherein: an aqueous solution of a humic acid-containing material is prepared with an alkali metal or ammonium base; an amine containing at least 16 carbon atoms and at lea... | 02/11/1986 |
| 4507210 | Method of determining the optimum aqueous composition for preventing _the swelling and dispersion of subterranean formation particles Disclosed is a process of formulating an aqueous medium to minimize the swelling and dispersion of subterranean formations contacted by the aqueous medium, particularly the aqueous phase of a water base drilling fluid. The process comprises: measuring a f... | 03/26/1985 |
| 4464274 | Organophilic clay suspending agents The invention provides methods of preparing organophilic clay suspending agents having enhanced dispersibility in oleaginous liquids, the organophilic clay containing suspending agents, and methods of increasing the viscosity of oleaginous liquids utilizi... | 08/07/1984 |
| 4435217 | Concentrated hydrophilic polymer suspensions The thermal aging stability of liquid suspensions of hydrophilic, water-soluble polymers in an organic liquid is improved by adding to the suspension a liquid fatty acid. Superior liquid polymer compositions having improved resistance to settling (syneres... | 03/06/1984 |
| 4435309 | Method of liquifying waxy materials The invention discloses a method of liquifying materials which are either waxy solids at ambient temperatures or solid or semi-solid mixtures of such waxy materials and a solvent therefor. Specifically, the invention discloses a method of preparing a liqu... | 03/06/1984 |
| 4435564 | Compositions and processes for using hydroxyethyl cellulose in heavy brines Processes are disclosed for activating hydroxyethyl cellulose (HEC) such that the HEC will disperse and hydrate in compatible heavy brines having a density greater than about 13.5 pounds per gallon containing one or more salts selected from the group cons... | 03/06/1984 |
| 4425244 | Organophilic clay gellants The invention provides methods of preparing organophilic clays having enhanced dispersibility in organic liquids, the organophilic clay containing gellants, and methods of increasing the viscosity of organic liquids utilizing these gellants.... | 01/10/1984 |
