Did You Know...
...that two musicians were responsible for the invention of color print film? Fascinated by photography, Leopold Godowsky and Leopold Mannes worked together to produce an easy-to-use, practical color film. They worked full time as music teachers and gave concerts while experimenting during their off hours in Mannes' kitchen. Their success earned them full-time, well-paying jobs at Kodak and their efforts resulted in Kodachrome film, which was introduced in 1935.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 6955695 | Conversion of petroleum residua to methane This invention discloses improvements on previous inventions for catalytic conversion of coal and steam to methane. The disclosed improvements permit conversion of petroleum residua or heavy crude petroleum to methane and carbon dioxide such that nearly all of the h... | 10/18/2005 |
| 5788948 | Process for the production of fluorometallate salts useful in the processing of mineral sands and related materials The present invention relates to a process for the production of intermediates useful in the processing of mineral sands and related materials characterized in that the process comprises: (a) dissolving a metal fluoride or metal chloride compound in an organic... | 08/04/1998 |
| 5681447 | Removal of trace metal and metalloid species from brine Process for the removal of heavy metal, metalloid and fluoride species present in trace mounts from aqueous brine of use in the production of chlorine and sodium hydroxide by electrolysis in membrane cells or in chlorate production; particularly to said r... | 10/28/1997 |
| 5433931 | Recovery of cerium Recovery of cerium values from fluoride-containing ores such as bastnasite is enhanced. The ore is ground, roasted, and leached with dilute hydrochloric acid to produce an ore concentrate. The concentrate is treated with a solution of hydrochloric acid an... | 07/18/1995 |
| 5245116 | Process for the wet treatment of spent pot linings from hall-heroult electrolytic cells A process for the treatment of spent pot linings impregnated with alkali metal cyanide and fluoric products by grinding previously crushed pot linings in the presence of lime, suspending the ground pot linings in an aqueous medium in order to precipitate ... | 09/14/1993 |
| 5207995 | Recovery of cerium from fluoride-containing ores Recovery of cerium values from fluoride-containing ores such as bastnasite is enhanced. The ore is ground, roasted, and leached with dilute hydrochloric acid to produce an ore concentrate. The concentrate is treated with a solution of hydrochloric acid an... | 05/04/1993 |
| 4816122 | Preparation of aluminum fluoride from scrap aluminum cell potlinings Fluoride-containing wastes, arising in the aluminium industry, particularly spent cell linings from reduction cells, are digested with caustic soda for conversion of sodium cryolite to NaF. By use of very strong caustic soda NaF may be left in the solid residu... | 03/28/1989 |
| 4790960 | Process for the stripping of cesium ions from aqueous solutions A process for the stripping of cesium ions from an aqueous solution in which a precipitation agent is added to the aqueous solution and the resulting precipitate, containing the CS+ ions is stripped from the solution. Sodium or lithium tetraph... | 12/13/1988 |
| 4777030 | Process for recovery of silicon from a reaction mixture A process is described for the recovery of silicon from a reaction mixture comprising silicon and an alkali metal fluoride.... | 10/11/1988 |
| 4640824 | Process for making alkali metal phosphate solutions containing little fluorine The disclosure relates to a process for making alkali metal phosphate solutions containing little fluorine from pre-purified alkali metal phosphate solutions obtained from crude phosphoric acid by extracting the acid with an organic solvent being immiscib... | 02/03/1987 |
| 4620966 | Process for defluorinating alkali metal phosphate solutions The disclosure relates to a process for defluorinating alkali metal phosphate solutions. To this end, the disclosure provides for an alkali metal phosphate solution neutralized to a pH-value of more than 6 and pre-purified to be stirred at 60° to 120° C... | 11/04/1986 |
| 4581207 | Recovery of aluminum from spent liquor A process for the purification of spent liquor from an alumina precipitation stage is disclosed wherein the spent liquor is first contacted with 50 volume % or less ethanol to form a sodium oxalate precipitate and the, after removal of the sodium oxalate ... | 04/08/1986 |
| 4464347 | Recovery of aluminum from spent liquor In accordance with the invention, spent liquor from an alumina precipitation stage is contacted with an extraction fluid to separate the mixture into a first layer comprising the extraction fluid and at least a portion of the caustic from the spent liquor... | 08/07/1984 |
| 4444740 | Method for the recovery of fluorides from spent aluminum potlining and the production of an environmentally safe waste residue A method for recovery of fluoride values from spent potlining and fluoride containing insulating materials associated with the potlining is disclosed. Spent potlining and the insulating materials are reduced to a fine particle size and incinerated. The as... | 04/24/1984 |
| 4374108 | Process of preparing alkali monofluorophosphate An alkali monofluorophosphate expressed by the formula M2 PO3 F, where M represents Na or K, can readily be synthesized under a relatively mild reaction condition by making HF gas contact with powdery or fine granular M4 P... | 02/15/1983 |
| 4251491 | Process for making sodium tripolyphosphate from wet process phosphoric acid Disclosed is a process for producing sodium tripolyphosphate (STPP) with reduced amounts of silicon and magnesium impurities from wet process phosphoric acid.... | 02/17/1981 |
| 4178347 | Process for the simultaneous production of wet process phosphoric acid and sodium silicofluoride A process for recovering fluorine and silicon values from a waste-water stream produced in a wet-process phosphoric acid process which comprises: (a) diluting concentrated sulfuric acid with the waste-water stream and producing an SiF4 -containing g... | 12/11/1979 |
| 4067957 | Process for producing hydrogen fluoride from an aqueous hydrofluorosilicic acid solution Potassium fluoride and silica are reacted with an aqueous solution of hydrofluorosilicic acid. The resulting potassium fluorosilicate is recovered. The potassium fluorosilicate may be further reacted with ammonia in water to form an aqueous mixture of amm... | 01/10/1978 |
| 4041127 | Method of treating the fluorine-containing mud produced by the acid polishing of lead glass so as to form basic lead carbonate A process is disclosed for the production of lead carbonate by treatment of fluorine-containing mud produced in the polishing of lead glass with etching acid comprising: A. separating said mud from the etching acid; B. reacting the same with an aqueous alkali ... | 08/09/1977 |
| 3980754 | Purification of alkali carbonate containing a fluorine compound An alkali carbonate containing a fluorine compound is purified by dissolving the crude alkali carbonate in an aqueous solution or suspension of magnesium bicarbonate in order to transfer the fluorine impurity into the resulting colloidal flocculated preci... | 09/14/1976 |
