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| Number | Title | Issue Date |
| 5775232 | Bridge plate for a mass transit vehicle A power operated retractable floor extension, extending outward from the floor of a mass transit vehicle. When extended, the floor portion bridges any gap between the vehicle floor and adjacent platform, thereby providing improved passenger access to the ... | 07/07/1998 |
| 5755060 | Compact panel lock for an overhead mounted door panel operator A compact mechanical lock for bi-parting handles of passenger doors used on mass transit vehicles. Rotating lock cams cooperating with an interlocking lock plate to ensure proper closure of each panel prior to lock actuation.... | 05/26/1998 |
| 5638773 | Method and apparatus for low NOX combustion of gaseous fuels A method and apparatus for low NOX combustion of natural gas in a compact steam boiler having output steam delivery controlled by predetermined outlet steam pressure. The compact boiler employs a small high heat release combustor discharging into a forced... | 06/17/1997 |
| 5587712 | Transponder having microprocessor generated frequency shift signals An improved transponder for use in identifying an controlling vehicles wherein transponders mounted on vehicles respond to signals from a fixed location interrogator providing information relative to the vehicle or other data as required. The transponder ... | 12/24/1996 |
| 5483769 | Door drive equipment for mass transit vehicle A power door operator for vehicles requiring uninterrupted car surfaces in a door area and minimal use of car interior space, particularly in the closed position. The equipment provided utilizes a rotary motor drive and distributed gear system for moving ... | 01/16/1996 |
| 5471957 | Compact boiler having low NOx emissions Method and apparatus for reducing the NOX levels in stack emissions of compact boilers and fluid heaters through selective injection of exhaust flue gases into the combustion process. Flue gas injection into the primary and secondary air of the burner alo... | 12/05/1995 |
| 5438800 | Stabilizer for outside sliding plug doors A stabilizing arm for use in power operated doors in mass transit vehicles. Doors are of the type where a door panel is moved out of an opening in the car side wall to an opened position outside the car side wall. Stabilization is achieved by moving a rot... | 08/08/1995 |
| 5433031 | Resilient edges for power operated doors A pair of flexible interlocking edges for power operated doors primarily used on mass transit vehicles such as subway cars. If door closing is prevented, edge design allows withdrawal of obstructions, including deformable objects caught in the interstices... | 07/18/1995 |
| 5433174 | Method and apparatus for low NOX combustion of gaseous fuels A method and apparatus for low NOX combustion of natural gas in a compact steam boiler having output steam delivery controlled by predetermined outlet steam pressure. The compact boiler employs a small high heat release combustor discharging into a forced... | 07/18/1995 |
| 5341598 | Power door drive and door support having motor operated locks Rotary locks used on transit vehicle doors when opened and closed by a rotating helical door drive member. In a preferred embodiment, a first lock utilizes a negative thread portion of the helical drive. A second lock utilizes a rotating lock pawl and sto... | 08/30/1994 |
| 5333574 | Compact boiler having low NOX emissions Method and apparatus for reducing the NOX levels in stack emissions of compact boilers and fluid heaters through selective injection of exhaust flue gases into the combustion process. Flue gas injection into the primary and secondary air of the burner alo... | 08/02/1994 |
| 5332279 | Power door operator for multi-passenger mass transit vehicles A power door operator for multi-passenger mass transit vehicles, typically buses, features electric actuation of dual swinging doors. A manual activator having an ergonometrically correct actuating plunger, for emergency door opening, operates a sleeved c... | 07/26/1994 |
| 5259342 | Method and apparatus for low NOX combustion of gaseous fuels A method and apparatus for low NOX combustion of natural gas in a compact steam boiler having output steam delivery controlled by predetermined outlet steam pressure. The compact boiler employs a small high heat release combustor discharging into a forced... | 11/09/1993 |
| 5192954 | Roadway antennae Antennas designed for use in producing effective electromagnetic capture zones for transponders mounted on moving vehicles. The antenna systems disclosed are principally designed to be mounted at or near the surface of a roadway carrying the vehicle whose... | 03/09/1993 |
| 5148631 | Pneumatic door operator having 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... | 09/22/1992 |
| 5130503 | Pressure wave switch having improved contact structure and pressure equilization An improved pressure switch of the pulse or pressure wave sensitive type includes a switch housing with an internal diaphragm chamber. A relief vent with a fixed orifice disk is provided in the diaphragm chamber. A diaphragm is mounted in the diaphragm ch... | 07/14/1992 |
| 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 |
| 4847623 | Radar tank gauge A sweep frequency, continuous wave (CW) radar tank gauge (3) providing measurement of the level of tank contents or ullage (19), having greatly improved accuracy through improved methods of processing calibrate and return signals directed toward the surfa... | 07/11/1989 |
| 4841721 | Very high efficiency hybrid steam/gas turbine power plant wiht bottoming vapor rankine cycle An improved thermal efficiency power plant for converting fuel energy to shaft horsepower is described. The conventional combustor of a gas tubine power plant is replaced by a direct contact steam boiler 8, modified to produce a mixture of superheated ste... | 06/27/1989 |
| 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 |
| 4737791 | Radar tank gauge A sweep frequency, continuous wave (CW) radar tank gauge (3) providing measurement of the level of tank contents or ullage (19), having greatly improved accuracy through improved methods of processing calibrate and return signals directed toward the surfa... | 04/12/1988 |
| 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 |
| 4708198 | Construction and method for improving heat transfer and mechanical life of tube-bundle heat exchangers An improved heat exchange construction for tube bundle heat exchange systems including shell (4) and tube (6) types (2), incorporating detached, essentially spherical flow interrupters (24, 26) arranged in an interconnected matrix configuration (22), and ... | 11/24/1987 |
| 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 |
| 4648835 | Steam generator having a high pressure combustor with controlled thermal and mechanical stresses and utilizing pyrophoric ignition A steam generator having substantial thermal capacity for producing high quality steam used primarily for downhole steam generation in tertiary oil recovery. Incorporated in the generator is a novel high pressure, high heat release combustor, utilizing hi... | 03/10/1987 |
| 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 |
| 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 |
| 4537384 | In-line check valve having combined downstream poppet support and flow control elements A poppet-type check valve utilizing an integral detachable flow control assembly for insertion into a cooperating housing. The checking poppet is oriented with its actuating stem, concentric guide, and concentric force bias spring downstream of the check ... | 08/27/1985 |
| 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 |
