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3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 7767162 | Concentric hopper and burn chamber for sulphorous acid generator This invention presents a sulphurous acid generator which employs a concentric hopper and burn chamber in which the burn chamber is surrounded or substantially surrounded by the hopper. The present invention also employs means for substantially eliminating any disch... | 08/03/2010 |
| 7250483 | Inhibition of catalytically active impurities in polycarbonate by the melt transesterification process An improvement to the melt transesterification process for the preparation of polycarbonate is disclosed. The improvement entails adding to the process between its medium viscosity reactor and a high viscosity reactor at least one bridged ester of organic sulphur-co... | 07/31/2007 |
| 7192517 | Coal-bed-methane water treatment system A water treatment system for treating coal-bed-methane (CBM) water. The CBM water treatment system includes a pump system for pumping CBM water from one or many CBM wells into a common reservoir and a solid-based sulfurous generator that produces aqueous sulfurous a... | 03/20/2007 |
| 7182919 | Sulphurous acid generator with air injector This invention presents a sulphurous acid generator which employs a combination of novel blending contact and mixing mechanisms which maximize the efficiency and duration of contact between sulphur dioxide gas and water to form sulphurous acid in an open nonpressuri... | 02/27/2007 |
| 7141220 | Open system sulphurous acid generator This invention presents a sulphurous acid generator which employs a combination of novel blending, contact and mixing mechanisms which maximize the efficiency and duration of contact between sulphur dioxide gas and water to form sulphurous acid in an open nonpressur... | 11/28/2006 |
| 7108842 | Process for the catalytic partial oxidation of HS using staged addition of oxygen A multistage oxygen-added catalytic partial oxidation process and apparatus for converting H2S in an acid gas stream to elemental sulfur and water are disclosed. Each staged addition of oxygen or air at the top of the catalyst bed and at points along the ... | 09/19/2006 |
| 7005115 | Gas combustion treatment method and apparatus therefor A gas combustion treatment method for the combustion treatment of an ammonia-containing gas and a hydrogen sulfide-containing gas, the method comprising a first combustion treatment step in which the ammonia-containing gas, together with a fuel, is introduced and bu... | 02/28/2006 |
| 6902713 | Method for partially oxidizing a gas stream comprising hydrogen sulphide and ammonia A method for partially oxidizing, in a Claus furnace, at least one gas containing hydrogen sulfide and ammonia with at least one gas rich in oxygen. The residual ammonia content at the outlet of the furnace is measured with a laser diode. Based upon this measurement... | 06/07/2005 |
| 6689326 | Method and apparatus for introducing sulphur dioxide into aqueous solutions This invention presents a sulphurous acid generator which employs a combination of novel blending, contact and mixing mechanisms which injects sulphur gases into aqueous solution or which maximize the efficiency and duration of contact between sulphur dio... | 02/10/2004 |
| 6572835 | Method and apparatus for producing gaseous sulfur trioxide An apparatus and method for producing sulfur comprises a vessel containing a plurality of spaced-apart channels each having an upstream end communicating with an upstream manifold and a downstream end communicating with a downstream manifold. Each channel... | 06/03/2003 |
| 6506347 | Open system sulphurous acid generator This invention presents a sulphurous acid generator which employs a combination of novel blending, contact and mixing mechanisms which maximize the efficiency and duration of contact between sulphur dioxide gas and water to form sulphurous acid in an open... | 01/14/2003 |
| 6500391 | Sulphurous acid generator with air injector This invention presents a sulphurous acid generator which employs a combination of novel blending contact and mixing mechanisms which maximize the efficiency and duration of contact between sulphur dioxide gas and water enriched with air/oxygen to form su... | 12/31/2002 |
| 6485683 | Headquarter vehicles for chemical biological nuclear defense Pyro sulfuric acid is employed to decontaminate air. Contaminated air is contacted with pyro sulfuric acid in a pyro sulfuric acid system, and released as decontaminated air. The system can be especially useful in a chemical/biological/nuclear defense mod... | 11/26/2002 |
| 6455012 | Acid gas burner and reactor apparatus and method An acid gas burner and reactor apparatus, and method when used in the Claus process, are improved over the prior art by the provision of a substantially continuous circular slot for the flow of a reactant gas from an annular conduit into the open outflow ... | 09/24/2002 |
| 6440379 | Apparatus to recover sulfur from concentrated acid gas into alkaline solution An apparatus and method for sulfur recovery uses a scrubber tower with a plurality of vertically spaced scrubber trays in the tower. Sulfide-lean liquor is supplied to each of the trays and an acid gas is supplied to the tower below the trays. A downcomer... | 08/27/2002 |
| 6312651 | Apparatus for burning a combustible gas containing hydrogen sulfide Apparatus for recovering sulphur from a combustible gas stream comprising hydrogen sulphide is provided. The combustible gas stream, air and oxygen, or an oxygen-rich stream, are fed via a coaxial burner into an elongate furnace thereby creating a longitu... | 11/06/2001 |
| 6248299 | Open system sulfurous acid generator A device which generates sulphurous acid in a simplified, efficient way comprises a burn chamber for burning sulphur to produce sulphur dioxide gas, a first conduit for conducting sulphur dioxide gas produced in the burn chamber, a second conduit for cond... | 06/19/2001 |
| 6080369 | Gas-to-gas heat exchangers for use in sulphuric acid plants A heat exchanger for use in a sulphuric acid manufacturing plant to effect heat transfer between desired gas streams selected from air, sulphur dioxide and sulphur trioxide. The exchanger provides for hot or cold split flow gas streams through the exchang... | 06/27/2000 |
| 6080368 | Open system sulfurous acid generator This invention presents a sulphurous acid generator which employs a combination of novel blending contact and mixing mechanisms which maximize the efficiency and duration of contact between sulphur dioxide gas and water to form sulphurous acid in an open ... | 06/27/2000 |
| 6045770 | Sulfur dioxide generation using granulated or emulsoid sulfur feedstock A flue gas conditioning system (FGC) for conditioning the flue gas flowing in a flue from a boiler to an electrostatic precipitator by injecting sulfur trioxide into the flue gas upstream of the electrostatic precipitator. The FGC has a source (52) of gra... | 04/04/2000 |
| 5842853 | Apparatus for producing SO2 -containing gas and cement clinker from waste gypsum A method and apparatus for producing SO2 -containing gas and cement clinker by splitting waste gypsum and anhydrite, using paper fibers as the reducing agent, and firing the splitting residue with additives. The cement forming additives are for... | 12/01/1998 |
| 5807530 | Process for burning of sulfur In the manufacture of sulfuric acid, elemental sulfur is reacted to by finely atomizing liquid sulfur into a vortex of combustion air and returning the atomized sulfur in the vortex during combustion, the ratio of air and sulfur supplied to the vortex bei... | 09/15/1998 |
| 5750881 | Method and apparatus for aspirating and dispensing sample fluids A method and apparatus for aspirating and dispensing a sample fluid. The apparatus includes an air source having an output port coupled to a first port of a flow through pressure transducer. A second port of the flow through pressure transducer is coupled... | 05/12/1998 |
| 5624653 | Method for producing sulphur trioxide The method for the production of sulphur trioxide, operating in a non-stanary regime, intend for sulphuric acid production. The aim of the present invention is to provide a method for the production of SO3 by catalytic oxidation of SO2, ... | 04/29/1997 |
| 5575993 | Ionene polymers containing biologically-active anions Ionene polymers having biologically-active organic and/or inorganic anions are described. Methods to prepare the ionene polymers, compositions containing them and their methods of use are also described.... | 11/19/1996 |
| 5547495 | Flue gas conditioning system The present invention provides a flue gas conditioning system and method for generating conditioning agent used in the removal of entrained particles in a flue gas flow with an electrostatic precipitator. The invention involves a catalytic converter that ... | 08/20/1996 |
| 5352421 | Method and apparatus for effecting gas-liquid contact Components, usually but not exclusively gaseous components, are removed in a liquid medium from gas streams and chemically converted into an insoluble phase or physically removed. Specifically, hydrogen sulfide may be removed from gas streams by oxidation... | 10/04/1994 |
| 5312597 | Apparatus for separating and recovering hydrogen isotopes An apparatus for recovering hydrogen and separating its isotopes. The apparatus includes a housing bearing at least a fluid inlet and a fluid outlet. A baffle is disposed within the housing, attached thereto by a bracket. A hollow conduit is coiled about ... | 05/17/1994 |
| 5308587 | Cooled sulphur furnace bypass system Apparatus and process for the production of gaseous sulphur dioxide mixture for conversion to sulphur trioxide in a catalytic converter in the production of sulphuric acid by the contact process. Apparatus comprises the furnace to produce sulphur dioxide ... | 05/03/1994 |
| 5240470 | In-duct flue gas conditioning system The present invention provides a flue gas conditioning system and method for generating conditioning agent used in the removal of entrained particles in a flue gas flow with an electrostatic precipitator. The invention involves the use of a catalytic conv... | 08/31/1993 |
| 5139764 | Sulfur recovery process for ammonia-containing feed gas Ammonia-containing sour gas is combusted at high flame temperature with at least 90 percent purity oxygen in an externally cooled combustor, the ammonia-free product is cooled, then, in conjunction with additional acid gas which does not contain ammonia, ... | 08/18/1992 |
| 5139765 | Dual combustion zone sulfur recovery process A sulfur recovery process wherein a minor fraction of a hydrogen sulfide-containing gas is precombusted with oxygen in an externally cooled combustion zone while extracting the major fraction of the heat released in the substantially complete combustion o... | 08/18/1992 |
| 5120496 | Stainless wrought and cast materials and welding additives for structural units exposed to hot, concentrated sulfuric acid In the processing of hot concentrated sulfuric acid or oleum in steel apparatus, the improvement wherein said apparatus is formed of an alloyed material comprising an iron-chrome-nickel-silicon alloy containing 13 to 32% by weight Cr, 5 to 25% by weight n... | 06/09/1992 |
| 5051233 | Stainless wrought and cast materials and welding additives for structural units exposed to hot, concentrated sulfuric acid In the processing of hot concentrated sulfuric acid or oleum in steel apparatus, the improvement wherein said apparatus is formed of an alloyed material comprising an iron-chrome-nickel-silicon alloy containing 13 to 32% by weight Cr, 5 to 25% by weight n... | 09/24/1991 |
| 5047216 | Apparatus for recovering elemental sulphur A piping arrangement for two or three Claus catalytic converters and condenser sets used for recovering sulphur from gas streams containing hydrogen sulphide. One of the converters is operated at a sub-dewpoint temperature while the other(s) is(are) opera... | 09/10/1991 |
| 4996038 | Heat recovery from concentrated sulfuric acid A method and apparatus for the recovery of heat from a sulfuric acid process are provided. Sulfur trioxide is absorbed into hot concentrated sulfuric acid, acid having a concentration greater than 98% and less than 101% and a temperature greater than 120Â... | 02/26/1991 |
| 4966757 | Sulfur dioxide generator An improved apparatus for burning sulfur to sulfur dioxide and generating sulfurous acid comprising a primary sulfur-burning chamber, a sulfur feed tank closely coupled to the primary chamber, a secondary sulfur burning chamber, and an absorption tower, A... | 10/30/1990 |
| 4915912 | Apparatus for the generation of sulfur trioxide reagent and sulfonation of the surface of polymeric resins The present invention provides an apparatus for generating a reagent of sulfur trioxide in a carrier which includes a reagent generator. The reagent generator has associated therewith means for introducing a source of sulfur trioxide into the reagent gene... | 04/10/1990 |
| 4857281 | Pauling boiler and process for the concentration of sulphuric acid A Pauling boiler for the concentration of sulphuric acid, wherein the external surface of the Pauling boiler is coated with aluminum. A process for the concentration of sulphuric acid in Pauling boilers by underfiring with gas or liquid fuels, wherein the conc... | 08/15/1989 |
| 4812295 | Apparatus for dry scrubbing a hot gas and start-up process Hot flue gas, such as the flue gas from a fossil fuel furnace or a waste incinerator, to be scrubbed to remove acidic gas, such as sulfur dioxide and hydrogen chloride gas, and particulates, such as fly ash, is passed to a primary drying chamber and conta... | 03/14/1989 |
