Famous Patents
Felix Hoffmann, a German chemist, was searching for something to relieve his father's arthritis. In doing so, he "rediscovered" acetylsalicylic acid and in 1900, patented a stable process for developing it. Hence, we have aspirin.
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| Number | Title | Issue Date |
| 4897995 | Liquid turbojet engine A liquid turbojet engine includes an elongated shaft, a housing mounted about the shaft with the shaft being rotatable relative to the housing about the shaft longitudinal axis, a conduit fixed to the shaft within the housing filled with an inert motive l... | 02/06/1990 |
| 4646515 | Two-phase engine An engine includes an elongated shaft, a housing mounted about the shaft with the shaft being rotatable relative to the housing about the shaft longitudinal axis, a conduit fixed to the shaft within the housing filled with an inert motive liquid and nozzl... | 03/03/1987 |
| 4201191 | Liquid fuels vaporization Apparatus for vaporization of liquids having a boiling point lower than that of water, comprising a vessel having at least three narrow planar plena, contiguous to each other, so that there is a single metal wall between each adjacent pair of plena. Gaseo... | 05/06/1980 |
| 4186058 | Method and apparatus for high volume distillation of liquids A method and closed system for high volume distillation of impure liquids comprises evaporating the impure liquid in an evaporator to form a vapor at a temperature above the freezing point and below the critical point, preferably the boiling point, of the... | 01/29/1980 |
| 4186060 | Method and apparatus for high volume distillation of liquids A method and apparatus for high volume distillation of impure liquid comprises evaporating the impure liquid in an evaporator to form a vapor at a temperature above the freezing point and below the boiling point of said liquid at atmospheric pressure and ... | 01/29/1980 |
| 4156421 | Method and apparatus for producing thermal vapor stream Method and apparatus for producing a thermal vapor stream for injecting into a subterranean formation for the recovery of liquefiable minerals therefrom, including a pressure vessel containing a high pressure combustion chamber for producing a heating gas... | 05/29/1979 |
| 4118925 | Combustion chamber and thermal vapor stream producing apparatus and method A new and improved method and apparatus for burning a hydrocarbon fuel for producing a high pressure thermal vapor stream comprising steam and combustion gases for injecting into a subterranean formation for the recovery of liquefiable minerals therefrom,... | 10/10/1978 |
| 4069807 | Hot air heater A high efficiency hot air heater is disclosed in which the combustion products of a flame are forced through water in a contacting device. The combustion products and whatever moisture is evaporated are passed through a heat exchanger to heat air such as ... | 01/24/1978 |
| 4035243 | Method and apparatus for high volume distillation of liquids A method and apparatus for high volume distillation of impure liquid comprises evaporating the impure liquid in an evaporator to form a vapor at a temperature above the freezing point and at or below the boiling point of said liquid at atmospheric pressur... | 07/12/1977 |
| 4018216 | Heat exchange apparatus Heat exchange apparatus for raising the temperature of a subject fluid in which a fuel burner is located at least partially within a heat-exchange liquid and the subject fluid is passed through heat-exchange liquid, the combustion products of the fuel bur... | 04/19/1977 |
