Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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 |
| 4691739 | Bootstrap reservoir An accumulator-reservoir device in a liquid cooling system utilizes a piston and metallic bellows to separate system pressures that are high and low in relation to one another. A piston position indicator is used sensing less than the full piston stroke i... | 09/08/1987 |
| 4682920 | Rotating air bearing An improvement in a machine tool or the like in which a work piece is held in a collet driven in a rotary sense and subject also to axial movements in which the work piece is gripped and released. A collet operating mechanism includes a frictionless air b... | 07/28/1987 |
| 4632360 | Butterfly type valve seal A pivotally adjustable valve disc has a ring seal set in its grooved periphery for contact with a wall of a valve accomodating bore. A flexible, radially expansible member is in the valve groove in a backing relation to the ring seal. Passages admit press... | 12/30/1986 |
| 4623019 | Heat exchanger with heat transfer control A heat exchanger core of the plate and fin type having intrinsic capabilities of controlled resistance to heat flow. Objectives are achieved without a need for special materials and without departing from practiced structural and fabrication standards. A ... | 11/18/1986 |
| 4620588 | Three fluid heat exchanger with pressure responsive control A three fluid heat exchanger in which first and second fluids are in a normally flowing heat transfer relation, with flow of a third fluid being dependent on a changing condition of one of the first or second fluids. Tubular heat exchanger cores are compr... | 11/04/1986 |
| 4607684 | Leak protected heat exchanger A plate and fin type heat exchanger in which different flowing fluids are placed in a segregated heat transfer relation and in which provision is made to deny opportunity for a leaked fluid from one flow or circuit to join or mix with fluid of another flo... | 08/26/1986 |
| 4589478 | Pressure protected tubular heat exchanger A heat exchanger of the tube and shell type comprising a shell and a shell enclosed tubular core, the core being removable from the shell for inspection and servicing. Motion of the core relative to the shell, and motion of core components relative to one... | 05/20/1986 |
| 4566530 | Pressure operated shuttle valve A valve assembly in which a longitudinally shiftable shuttle or spool valve is positioned by varying the fluid pressure in a pressure chamber at one end thereof. Solenoid valves open and close in a pulsed response to a changing fluid condition, the flow o... | 01/28/1986 |
| 4538972 | Bootstrap reservoir In a liquid coolant circulating or like system an accumulator--reservoir device of the bootstrap type. The reservoir device has a sliding seal construction, in which a piston is subject to high and low pressure influences as these relate to discharge and ... | 09/03/1985 |
| 4528733 | Method of making tubular heat exchangers A method of mechanically joining tubes to headers in tubular heat exchangers of a high density, high performance type. The headers are made of a heat recoverable metallic material and worked while in a martensitic state to be subsequently shrunk upon inst... | 07/16/1985 |
| 4527785 | Machine tool apparatus For use in a milling or like machine, a fixture is provided to hold a part to be machined, the fixture including portions to clamp the part against relative shifting motion. A mount for the fixture includes components movable in tilting and vertical sense... | 07/09/1985 |
| 4482415 | Sealing mechanical tube joints A method of making leak-tight tube joints, in a non-brazed tubular heat exchanger or the like, including the steps of expanding tube ends out into mechanical contact with a header plate in which they are received, and, in conjunction with this step, intro... | 11/13/1984 |
| 4480165 | Braze fixture and method of using A holding fixture for use in the brazing of heat exchangers applying multiple holding pressures, two of which are in senses opposed to one another. Cage members mount a heat exchanger between them and are biased in a separating sense. At the same time the... | 10/30/1984 |
| 4469275 | Thermostatic device with fail-safe capability A device in a fluid flow path moves to perform a fluid flow control operation at a predetermined high fluid temperature. A mechanism normally locked out of participation in the movements of the device is released at a selected fluid temperature higher tha... | 09/04/1984 |
| 4453301 | Sealing mechanical tube joints A method of making leak-tight tube joints, in a non-brazed tubular heat exchanger or the like, including the steps of expanding tube ends out into mechanical contact with a header plate in which they are received, and, in conjunction with this step, intro... | 06/12/1984 |
| 4380868 | Tube loading apparatus Apparatus in generally unitary machine form for the mechanical, automatic installation of tubes in an assembly of header plates and baffles to produce a tubular heat exchanger core or the like. Tubes are inserted one at a time in perforate parts held in a... | 04/26/1983 |
| 4376619 | Accumulator-reservoir device diaphragm control A fluid circulating system including a pump and an accumulator-reservoir device of the bootstrap type in which operation of the pump energizes the device to maintain a pressurized system despite an increasing fluid density caused by lowering fluid tempera... | 03/15/1983 |
| 4350201 | Self fixturing heat exchanger A heat exchanger of the plate and fin type which due to the presence of interacting parts is inherently self fixturing in assembly, obviating a need for a holding fixture in assembly and preparatory to and during brazing. The heat exchanger features use o... | 09/21/1982 |
| 4336824 | Cartridge valve A cartridge valve in which parts made separable for convenience of manufacture and for a use of different materials within the same assembly are interconnected for unitary installation and removal.... | 06/29/1982 |
| 4319630 | Tubular heat exchanger A tubular heat exchanger, the core of which is comprised of two sets of U-shaped tubes facing in opposite directions. A header plate receives the ends of one set of tubes. Another, longitudinally spaced, header plate receives the ends of the other set of ... | 03/16/1982 |
| 4305457 | High density fin material A fin strip of the kind used as secondary heat transfer surface in heat exchangers. Convolutions in the strip are formed to increase the developed length of a fin strip and thereby to increase the surface area which can be accommodated in a given space, p... | 12/15/1981 |
| 4301831 | Pressure regulating valve with differential pressure response Valve apparatus including a regulating valve controlling fluid flow through a duct and positionable to produce a regulated downstream pressure from a normally relatively higher upstream pressure. A pilot valve enables a relatively reduced fluid pressure t... | 11/24/1981 |
| 4302020 | Actuating sealing joint A joint for sealing around rods, shafts, cylinders and the like. A metallic sealing ring is configured for axial pressure control and is installed without substantial frictional contact with surfaces to be sealed. An actuating member is a part of the join... | 11/24/1981 |
| 4285632 | Oiling system for rotor bearings An oiling system in turbo and like machinery providing cooling, lubricating and fluidized damping functions. A rotor shaft operates in connection with a reservoir of lubricating oil, and with a lubricant supply mechanism, to supply oil to the shaft bearin... | 08/25/1981 |
| 4282927 | Multi-pass heat exchanger circuit A concept for reducing the number of parts in, and for simplifying the assembly of, a plate and fin type heat exchanger in which a fluid makes plural passes at least at one level of the heat exchanger. A single layer of a secondary heat transfer material ... | 08/11/1981 |
| 4233821 | Rotor support A rotor support in turbo and like machinery. A rotor has bearing support in a tubular cartridge member. In a cantilever construction, the cartridge member is fixed at one end to a first housing wall and extends perpendicularly therefrom to a non-rigid mou... | 11/18/1980 |
| 4221261 | Brazeless heat exchanger of the tube and shell type A tube and shell heat exchanger of a brazeless type. A single header construction mounts tubes made for high efficiency heat transfer and supported for damage free operation. A removable mounting plate confines a tube and header core in a shell and is ada... | 09/09/1980 |
| 4215816 | Thermally controlled valve with safety inspection feature Thermal actuating or like apparatus in which a sight conduit is comprised in a valve housing enabling the changing position of a thermal actuator within the housing to be observed from outside the housing. A fiber optic device acts as the sight conduit an... | 08/05/1980 |
| 4215454 | Attaching fin material to a heat transfer or like surface A heat transfer or like surface has fins attached thereto in a disconnected, spaced apart, substantially parallel relation, the fins standing upright on edge on the surface. A method of producing and attaching the fins has particular utility in the presen... | 08/05/1980 |
| 4203566 | Air inlet control for aircraft or the like An air inlet control inset in the skin or outer wall surface of an aircraft or the like. The control device has an open position in which it is able to capture ram air flowing over the wall surface and which at the same time defines an open flow area thro... | 05/20/1980 |
| 4170554 | Wastewater treatment method A method of pollution abatement in the outflow of wastewater from a manufacturing plant or the like. A simultaneous precipitation of chromium and flouride contaminants is carried out with a subsequent removal of precipitates under conditions substantially... | 10/09/1979 |
| 4155571 | Sealing member and retainer assembly for sealing non-grooved joints A self-locating sealing assembly in which a compressible sealing member and an encircling retainer ring make an assembly for sealing non-grooved joints. The sealing assembly has special application to a standard type pipe flange having a relatively projec... | 05/22/1979 |
| 4155157 | Braze fixture A fixture useful both to receive and position parts assembled for brazing and to hold the assembled parts during the brazing process. Part locators in the fixture position the parts during assembly or loading, and remain attached to the fixture during bra... | 05/22/1979 |
| 4152818 | Making mechanical tube joints A method of making mechanical tube joints in whichfirst and second metal working operations, applied through a ferrule installed in a tube end in a header plate, effect initially a tight fit of the tube end in the plate followed by a sealing contact. The ... | 05/08/1979 |
| 4128235 | Braze fixture A fixture useful both to receive and position parts assembled for brazing and to hold the assembled parts during the brazing process. Part locators in the fixture position the parts during assembly or loading, and remain attached to the fixture during bra... | 12/05/1978 |
| 4114395 | Integrated refrigerant storage canister and heat exchanger A heat exchanger-canister combination, the canister being used to hold a solid state refrigerant absorbing heat from a circulating fluid heated at a relatively remote source, the walls of the canister being used to transfer heat into the contained refrige... | 09/19/1978 |
| 4076164 | Pre-blistering of braze joints A method, in the art of brazing metallic parts to one another, including a step of subjecting a brazed assembly to relatively high temperatures over a relatively short period of time in a manner to induce blistering of unbrazed or weakly brazed areas. Bli... | 02/28/1978 |
| 4067381 | Temperature compensated quantity indicator Apparatus indicating the quantity of fluid in a closed and pressurized fluid circulating system. The apparatus compensates or corrects for fluid expansion and contraction due to temperature change so that the indicated quantity is the true quantity. The a... | 01/10/1978 |
| 4059882 | Method of making an annular tube-fin heat exchanger A method of making a heat exchanger in which extended heat transfer material, such as a fin annulus composed of thin corrugated deformable metal, is installed in annular fluid flow paths defined between concentric tubes. Concepts of electromagnetic formin... | 11/29/1977 |
| 4055472 | Method of preparing nickel alloy parts for plating A plating preparation method in which a nickel part is placed in an electrolyte bath of such acid concentration and such temperature as to promote thorough etching of the part surface and in which an etched part is allowed to soak in the same electrolyte ... | 10/25/1977 |
