Famous Patents
The first commercial microwave oven was nearly 6 feet tall and weighed in at 750 pounds.
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 |
| 4901474 | Pneumatic door operator having novel pneumatic actuator and lock A power door operator for transit vehicles utilizing a rodless pneumatic cylinder as a prime mover in opening and closing doors in the sidewall of a transit vehicles. Door movement having a controlled, predetermined door edge force is achieved through mec... | 02/20/1990 |
| 4882876 | Door operator with locking mechanism Disclosed is an operator for a door mounted by frame means so as to be slidable along a track between open and closed positions. The door has a peripheral edge which is engaged to provide a positive locking of the door. The operator includes a shaft rotat... | 11/28/1989 |
| 4804910 | Traction load meter system A traction load meter system for displaying information concerning the amount of current energizing electric motors which drive a locomotive. These motors have power and braking modes and have a continuous current rating. The system includes a current-to-... | 02/14/1989 |
| 4722361 | Modulating pressure operated pilot relief valve The pilot valve 206 disclosed utilizes a piston 226 operating intermediate a pressure setting spring 234 and main valve head volume 222 vent valve, and having a single pressure sensing chamber 235. The operating piston includes an elongated extension 229 ... | 02/02/1988 |
| 4704870 | Thermoelectric cooler A thermoelectric cooler (10) having a storage compartment (36) with insulated inside walls forming an access opening on one side opposite a back wall (42a) of substantially the same size includes an insulated door (40) movable between a closed position se... | 11/10/1987 |
| 4653227 | Door operating assembly A door operating assembly for opening and closing vehicle doors at a constant door edge force includes a frame. A teeter lever assembly is pivotally mounted on the frame and is connected to a connecting rod assembly connecting the teeter lever assembly an... | 03/31/1987 |
| 4628835 | Waste fluid incinerator having heat recovery means An incinerator particularly suited for disposal of waste fluids containing undesirable chemicals and hydrocarbons including sodium cyanide. A novel dual fuel combustion system wherein the waste fluid is injected intermediate an inner high temperature flam... | 12/16/1986 |
| 4627242 | Thermoelectric cooler A thermoelectric cooler of rugged construction for use in cabs of a railway locomotive includes a housing with a storage compartment mounted therein surrounded by insulation. The compartment is fabricated of thermoconductive material and includes flat sid... | 12/09/1986 |
| 4621592 | Boiler having improved heat absorption A flash boiler or steam generator includes a shell defining a combustion chamber. A coil bank is mounted adjacent to the combustion chamber and includes an inner coil defining a heat absorption chamber. An intermediate coil is positioned in the chamber su... | 11/11/1986 |
| 4620490 | Door seal A seal for an access door (44) mounted on a combustion chamber of a fluid heater includes a gasket pad (56) that is sealed to the interior surface of the door (52) by adhesive material. The gasket pad is secured to the door by first applying adhesive mate... | 11/04/1986 |
| 4616528 | Valve actuator with continuous manual override A valve actuator with manual override includes an input shaft for receiving input torque. The input shaft drives an epicyclic gear train sun gear and in turn is motor driven through a non-reversible gear set. The sun gear is in driving engagement with fir... | 10/14/1986 |
| 4615356 | Modulating pressure operated pilot relief valve A main valve includes a product pressure inlet, an outlet, a movable closure member and a pressurized head volume above the closure member. Product pressure relief flow through the main valve is controlled by a modulating, pressure operated pilot relief v... | 10/07/1986 |
| 4611104 | Electromechanical switch actuator having high security key actuator An electromechanical switch actuator operated by a detachable, mechanical key providing security against unauthorized operation. The switch actuator disclosed is of particularly rugged construction, arranged to provide rotary torque for operating axially ... | 09/09/1986 |
| 4593654 | Combustion and feedwater controller for a flash boiler A feedwater controller for a flash type water tube boiler wherein feedwater flow through steam generating coils heated by combustion gases is compensated and adjusted, in order to provide proper combustion heat input over a broad range of boiler operating... | 06/10/1986 |
| 4583466 | Step lift for railway cars Apparatus for railway cars to handle the ingress and egress of passengers through a door opening where the apparatus selectively provides at the exterior of the car at the door opening an adjustable height platform, steps or a ground-to-car floor platform... | 04/22/1986 |
| 4556083 | Pressure relief valve and method for modification thereof A pressure relief valve operable in large transient pressure conditions includes a valve body. A valve seat is movably mounted on the body. A valve disc or pallet is pivotally connected to the valve body by a valve arm and aligned to engage the valve seat... | 12/03/1985 |
| 4552335 | Ball valve A high pressure ball valve including a valve body with inlet and outlet ports, a ball having a passageway therethrough disposed between the ports, and seats between the ball and the ports guidably supporting the ball. Each seat includes a core of polyethe... | 11/12/1985 |
| 4538551 | Refractory choke for a high intensity combustor A boiler includes a high intensity combustor mounted in a shell that defines the boiler housing. A coil bank is mounted in the boiler and spaced from the combustor. A fire pot is positioned in the combustor and defines a combustion chamber with a combusti... | 09/03/1985 |
| 4515179 | Pressure relief valve with adjustment for set pressure A pressure relief valve includes a housing defining an internal valve chamber. A valve seat is positioned within the chamber, and a valve pallet is reciprocally mounted within the chamber to engage the seat in a valve closed mode. A spring is mounted with... | 05/07/1985 |
| 4491917 | Door control systems A door control system, particularly suited for multiple door rapid transit vehicles wherein car operating parameters including car speed sensing (5), traction propulsion sensing (7), and other indications of internal circuitry establish and continuously t... | 01/01/1985 |
| 4490941 | Spindle door operator A door operator for opening and closing doors on transit vehicles and the like includes an actuator (50) secured to the transit vehicle (10). The actuator houses a worm drive and a reciprocating air cylinder (52) for imparting rectilinear motion to the wo... | 01/01/1985 |
| 4450854 | Lubricated split plug valve A lubricated split plug valve includes a valve body defining a chamber with fluid ports therethrough. A valve stem is rotatably mounted in the body and engages a split cylindrical valve member. The valve member includes a cylindrical passage with first an... | 05/29/1984 |
| 4449695 | Fire safe plug valve A valve for controlling the flow of fluids of a flammable nature and under high pressure, which includes a hollow body having a plug rotatably mounted within the body between the floating seats at inlet and outlet ports with a packing plate in the bonnet ... | 05/22/1984 |
| 4445023 | Electric thermal storage heater system for heating fluids A thermal storage heater system for heating fluids includes a storage tank for accumulating and storing energy in the form of a quantity liquid heated to a high temperature by an electric immersion heating element in the tank. A source of a first fluid to... | 04/24/1984 |
| 4422387 | Door seal A seal for an access door (44) mounted on a combustion chamber of a fluid heater includes a gasket pad (56) that is sealed to the interior surface of the door (52) by adhesive material. The gasket pad is secured to the door by first applying adhesive mate... | 12/27/1983 |
| 4410005 | Pilot operated relief valve A pilot operated relief valve for use on medium and high pressure vessels, conduits, and the like. A two-stage, non-flowing valve (5) operates a main relief valve (7) of substantially greater capacity. Flow control elements provided by (35), (36), (38), a... | 10/18/1983 |
| 4407623 | Lift assembly including a reaction switch A lift system for a transit vehicle includes a stationary main frame secured within a door recess of the vehicle and a side frame that is movable relative to the main frame. An articulated platform including steps pivotally secured to the side frame and s... | 10/04/1983 |
| 4402341 | Pilot operated relief valve A pilot operated relief valve for use on medium and high pressure vessels, conduits and the like. A two-stage, non-flowing valve (5) operates a main relief valve (7) of substantially greater capacity. Flow control elements provided by (35), (36), (38), an... | 09/06/1983 |
| 4393893 | Lubricated split plug valve A lubricated split plug valve includes a valve body defining a chamber with fluid ports therethrough. A valve stem is rotatably mounted in the body and engages a split cylindrical valve member. The valve member includes a cylindrical passage with first an... | 07/19/1983 |
| 4390041 | Pilot operated relief valve A pilot operated relief valve for use on medium and high pressure vessels, conduits, and the like. A unique two-stage, non-flowing pilot valve operates a main relief valve of substantially greater capacity. In a preferred embodiment main valve is mounted ... | 06/28/1983 |
| 4379680 | Ambient air timing device An air timing device for a high pressure reciprocating injector pump 14 employing a piston or movable wall 50 and orifice 48 combination that is mechanically reset on the suction stroke of the pump includes a bellows 42 defining a variable volume chamber ... | 04/12/1983 |
| 4371762 | Contactless pressure sensitive switch A contactless pressure switch 10 sensitive to fluid pressure rates of change includes a housing 36 and a diaphragm 42 secured in the housing defining first and second chambers. Ports 48, 50 are included in the first and second chambers to vent the chamber... | 02/01/1983 |
| 4369344 | Sensitive door edge Wiegand module switch assembly A sensitive edge 10 for door systems, lifts, doors, or other moving portions of transit vehicles that come into contact with articles or passengers includes a body defining a resilient deformable leading edge portion 30 and a base portion 32 within which ... | 01/18/1983 |
| 4362949 | Load controller having time integrated demand A load controller, primarily intended for use in systems having geographically distributed, energy utilizing loads, and employing stored energy heating apparatus. The controller (1, 10) disclosed, in conjunction with a stored energy heater (3, 4), when in... | 12/07/1982 |
| 4355657 | Pilot operated relief valve A pilot operated relief valve for use on medium and high pressure vessels, conduits, and the like. A unique two-stage, non-flowing pilot valve (5) operates a main relief valve (7) of substantially greater capacity. Flow control elements provided by 35, 36... | 10/26/1982 |
| 4341398 | System for controlling the kneeling operation of air suspension equipped transit vehicles A system for controlling the kneeling operation of air suspension equipped transit vehicles includes air suspension members (20, 22, 24, 26, 28, 30) mounted at the wheels of the transit vehicle (10) and a fluid reservoir (32). A fluid circuit is included ... | 07/27/1982 |
| 4316598 | Balanced relief valve with novel seal A pilot operated pressure relief valve for use on medium and high pressure vessels, conduits, and the like. A two-stage, non-flowing pilot valve operates a main relief valve of substantially greater capacity. In a preferred embodiment the main valve is mo... | 02/23/1982 |
| 4305005 | Load controller A load controller, primarily intended for use in systems having geographically distributed, energy utilizing loads, and employing stored energy heating apparatus. The controller (1, 10) disclosed, in conjunction with a stored energy heater (3, 4), when in... | 12/08/1981 |
| 4303003 | Switching valve A pilot operated switching valve includes a sliding spool that is actuated by pilot pressure to control fluid through the valve to a prime mover. The ends of the spool are exposed to pilot pressure that moves the spool within the valve housing to control ... | 12/01/1981 |
| 4302159 | Ambient air timing device An air timing device for a high pressure reciprocating injector pump 14 employing a piston or movable wall 50 and orifice 48 combination that is mechanically reset on the suction stroke of the pump includes a bellows 42 defining a variable volume chamber ... | 11/24/1981 |
