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 |
| 7365444 | Active anti-islanding system and method An engine control system suited for use with an engine that outputs electrical power to a local load and is electrically connected to an electrical grid. The engine generates power at a power output value and the load consumes power at a load value. The engine contr... | 04/29/2008 |
| 5844134 | Gas meter cabinet and unitary manifold A gas meter cabinet is adapted for mounting within a wall of a building. The cabinet has a body partially recessed within the building wall. A perforation at the top of the cabinet accommodates a gas line. A door is coupled to the body. A manifold connect... | 12/01/1998 |
| 5769569 | In-situ thermal desorption of heavy hydrocarbons in vadose zone An in-situ thermal desorption system and process is utilized for mobilization and removal of nonvolatile and semi-volatile hydrocarbons from contaminated soil in the vadose zone. Persistent hydrocarbons are thermally desorbed by direct heating of the cont... | 06/23/1998 |
| 5654505 | Gas meter cabinet and unitary manifold A gas meter cabinet is adapted for mounting within a wall of a building. The cabinet has a body partially recessed within the building wall. A perforation at the top of the cabinet accommodates a gas line. A door is coupled to the body. A manifold connect... | 08/05/1997 |
| 5595207 | Tension actuated gas shutoff valve A tension actuated gas shutoff valve having a body with an inlet for receiving gas flow along a flow path from upstream to downstream and a piston slidable within the body. The piston slides in response to a longitudinal force applied across the valve bet... | 01/21/1997 |
| 5577528 | Apparatus for upgrade or repair of in-service pipelines A removable apparatus for upgrade of an in-service pipeline without disrupting the flow of fluid within the in-service pipeline. The removable apparatus comprises at least one enclosure having a top section and a bottom section for temporarily enclosing a... | 11/26/1996 |
| 5427525 | Lox NOx staged atmospheric burner A two stage, atmospherically supplied burner which produces reduced levels of NOx in applications such as residential water heaters or light commercial applications. A novel, perforated plate first stage burner is disclosed for first stage comb... | 06/27/1995 |
| 5240404 | Ultra low NOx industrial burner An industrial gas burner is disclosed which operates at low air/fuel ratios to avoid NOx formation without carbon sooting. The burner includes a refractory block having a cylindrically stepped throat passage extending therethrough, a housing ad... | 08/31/1993 |
| 5127267 | Acoustic method for locating concealed pipe A method for determining the location of a concealed pipe is disclosed. An identifiable acoustic signal is injected into the concealed pipe. The signal propagates along the interior length of the pipe. The signal is detected by an array of detectors posit... | 07/07/1992 |
| 4520265 | Method and apparatus for accurate remote monitoring of gases Apparatus is provided which permits highly accurate remote measurement of methane gas concentrations even in daylight through the use of an extremely narrow spectral filter centered on the Q-branch of the methane absorption band at 3.3 microns and through... | 05/28/1985 |
| 4497362 | Regenerative room air exchanger A regenerative room air exchanger for use in a house has a first vertically disposed conduit through which room air flows to be exhausted, the first conduit including a first set of vertically disposed channels, a second vertically disposed conduit throug... | 02/05/1985 |
| 4448545 | Non-intrusive thermal power monitor and method A non-intrusive thermal power monitor and method for determining the amount of sensible heat withdrawn from or added to a fluid stream flowing in a conduit by an unknown source includes a thermal power transfer device that supplies or removes a known amou... | 05/15/1984 |
| 4333524 | High efficiency furnace A heat exchanger and process having multiple fluidized beds for heat exchange between two gas streams of different temperatures. The apparatus and process provides a compact high efficiency warm air furnace especially adapted for energy conservation for t... | 06/08/1982 |
| 4319628 | Two liquid heat exchange system and safety valve to prevent contamination A two liquid heat exchange system, and a safety valve to prevent contamination of one liquid (first liquid) by the other. In systems such as hydronic solar systems, it is customary for a first liquid to be heated and run through a heat exchanger where its... | 03/16/1982 |
| 4249594 | High efficiency furnace A heat exchanger and process having multiple fluidized beds for heat exchange between two gas streams of different temperatures. The apparatus and process provides a compact high efficiency warm air furnace especially adapted for energy conservation for t... | 02/10/1981 |
| 4237969 | Heat transfer element to replace electrical heating element A novel heat transfer element which permits simple, low-cost conversion of energy inefficient electrically heated water heaters to energy efficient potable-water storage tanks for storing water heated by energy-efficient gas-fired water heating systems.... | 12/09/1980 |
