Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 4927621 | Purification of anhydrous hydrogen chloride A method to purify impure gaseous hydrogen chloride containing an unsaturated chlorinated hydrocarbon contaminant in an amount less than that necessary to inhibit purification, comprising exposing the impure hydrogen chloride to an ultraviolet light sourc... | 05/22/1990 |
| 4859344 | Method for underground support and removal of hazardous ions in ground waters Rectifying the compressive strength and toxic waste levels of ground water passages is achieved through the formation of a type C fly ash screen reinforcement of the passage.... | 08/22/1989 |
| 4561959 | Flat-plate electrolytic cell The invention relates to an ion exchange-type electrolytic cell with electrodes retained in close proximity to each other by means of a spring element.... | 12/31/1985 |
| 4401435 | Oxidizing medium for dyes An acidic, aqueous oxidant including ionized bromate, iodate and a soluble vanadium-containing material.... | 08/30/1983 |
| 4380521 | Method to produce a polytetra-fluoroethylene diaphragm The method of the present invention produces a porous, electrolyte permeable polytetrafluoroethylene diaphragm with a thickness of about 5 to about 100 mils and an average pore size of about 0.1 to about 100 microns. This diaphragm is suitable for use in ... | 04/19/1983 |
| 4330525 | Process for the production of dead burned refractory magnesia High density, dead burned refractory magnesia (MgO) is produced by sintering compacts formed by simultaneously thermally dehydrating and mechanically working an aqueous slurry of magnesium hydroxide.... | 05/18/1982 |
| 4321054 | Oxidizing medium for dyes An acidic, aqueous oxidant including ionized bromate, iodate and a soluble molybdenum-containing material.... | 03/23/1982 |
| 4219401 | Metal electrowinning feed cathode Feed cathode for an electrolytic cell with a feed conduit suited to pass a metal compound therethrough from a source to an electrolyte in the cell. The feed cathode includes a member surrounding and substantially entirely enclosing at least an outlet of t... | 08/26/1980 |
| 4214971 | Electrode coating process A method to produce an electrode by coating at least a portion of a valve metal substrate sequentially with first and second liquid solutions containing different proportions of dissolved ruthenium and valve metal values; the second solution having a grea... | 07/29/1980 |
| 4181585 | Electrode and method of producing same An electrode suitable for use in an electrolytic cell is dissolved. The electrode comprises: an electroconductive substrate with at least a portion of the surface thereof being a solderable metal. The electroconductive substrate abuttingly joins a film-fo... | 01/01/1980 |
| 4137296 | Production of chlorine dioxide A method is disclosed to produce chlorine dioxide from sodium chlorate by reacting the chlorate with HCl. The method comprises forming in a reaction vessel an aqueous reaction medium containing at least about 5.5 moles per liter of the sodium chlorate, su... | 01/30/1979 |
| 4118291 | Method of electrowinning titanium A method to electrolytically produce metallic titanium from compounds thereof. The method includes first positioning a foraminous metallic diaphragm with a diaphragm coefficient of greater than zero to about 0.5 when the coefficient of flow is about 0.1 t... | 10/03/1978 |
| 4116801 | Apparatus for electrowinning multivalent metals An apparatus to electrolytically produce multivalent metals, such as titanium, from compounds thereof. The apparatus includes a suitable containing body with an anode and a cathode in compartments therein spaced apart by a foraminous metallic diaphragm. T... | 09/26/1978 |
| 4116782 | Corrosion prevention system A method to reduce corrosion of a metal conduit in an aqueous electrolyte conduit system including a nonmetallic conduit system physically attached to the metal conduit comprising impressing an electric potential between an electrode positioned at least p... | 09/26/1978 |
| 4113584 | Method to produce multivalent metals from fused bath and metal electrowinning feed cathode apparatus Feed cathode for an electrolytic cell with a feed conduit suited to pass a metal compound therethrough from a source to an electrolyte in the cell. The feed cathode includes a member surrounding and substantially entirely enclosing at least an outlet of t... | 09/12/1978 |
| 4112140 | Electrode coating process A method to produce an electrode by coating at least a portion of a valve metal substrate sequentially with first and second liquid solutions containing different proportions of dissolved ruthenium and valve metal values; the second solution having a grea... | 09/05/1978 |
| 4110402 | Recovery of strontium from brine that contains strontium and calcium Strontium values are recovered from a brine that contains strontium and calcium salts by admixing, with the brine, strontium sulfate seed and a water soluble sulfate and recovering the strontium sulfate that is thereby produced. The soluble sulfate should... | 08/29/1978 |
| 4082630 | Electrolytic cell brine feed system An electrolytic cell system wherein an alkali metal chloride is electrolized to produce chlorine and alkali metal hydroxide in a diaphragm-type cell by feeding an aqueous slurry of an alkali metal chloride particulate to an anode compartment of the cell t... | 04/04/1978 |
| 4035255 | OPERATION OF A DIAPHRAGM ELECTROLYLYTIC CELL FOR PRODUCING CHLORINE INCLUDING FEEDING AN OXIDIZING GAS HAVING A REGULATED MOISTURE CONTENT TO THE CATHODE Improved apparatus and process to electrolytically produce chlorine gas and an alkali metal hydroxide in a diaphragm cell. The improved process comprises circulating the catholyte and contacting a foraminous cathode with an oxidizing gas having a regulata... | 07/12/1977 |
| 4035254 | OPERATION OF A CATION EXCHANGE MEMBRANE ELECTROLYTIC CELL FOR PRODUCING CHLORINE INCLUDING FEEDING AN OXIDIZING GAS HAVING A REGULATED MOISTURE CONTENT TO THE CATHODE Improved apparatus and process to electrolytically produce chlorine gas and an alkali metal hydroxide in a diaphragm cell. The improved process comprises employing a cation exchange diaphragm and contacting a foraminous cathode with an oxidizing gas havin... | 07/12/1977 |
| 4025449 | Process to produce barium and strontium ferrite A method to produce a magnetic barium or strontium ferrite comprising solubilizing an alkaline earth metal compound in an aqueous solution containing about 20 to about 60 weight percent alkali metal hydroxide. The resulting solution is heated to within th... | 05/24/1977 |
