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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 4800712 | Grass catcher mounting system A lawn mower comprising a housing including a discharge chute, a door mounted on the housing for pivotal movement between a closed position preventing discharge from the chute of grass clippings and an open position permitting discharge from the chute of ... | 01/31/1989 |
| 4800713 | Rotary rakes A rotary rake in which each of the pin wheels (i.e. disk wheels) being arranged in echelon manner, has rearwardly inclined gaps between respective fingers whereby to promote removal of debris that otherwise will jam between the fingers.... | 01/31/1989 |
| 4800714 | Guide chain A guide chain for carrying lines that supply all types of expendable material from a fixed connection to a movable consuming device. In order to provide the guide chain with a periphery that is as completely closed as possible and has as smooth a surface ... | 01/31/1989 |
| 4800715 | Apparatus for suppressing infrared radiation emitted from gas turbine engines Successful flight of high altitude military aircraft is dependent, in part, pon the ability of the aircraft to remain undetected during flight. Against the highly sophisticated infrared sensors developed during recent years, particularly for miliary use, a... | 01/31/1989 |
| 4800716 | Efficiency arcjet thruster with controlled arc startup and steady state attachment An improved efficiency arcjet thruster has a constrictor and electrically-conductive nozzle anode defining an arc chamber, and an electrically-conductive rod having a tip spaced upstream from the constrictor and defining a cathode spaced from the anode by... | 01/31/1989 |
| 4800717 | Turbine rotor cooling Increased turbine inlet temperatures and/or extended life of turbine rotors in gas turbine engines is achieved by locating a plurality of passages 50 that extend axially in the disc 46 and turbine blades 32 of a so-called monorotor. The passages 50 have i... | 01/31/1989 |
| 4800718 | Surface cooling system A cooling system for providing a layer of relatively cool gas (28) adjacent the surface of a duct (24) carrying a flow of relatively hot gas (22) includes an elongated louver nozzle (32), an elongated plenum (40) and one or more crosswise dividers (42) fo... | 01/31/1989 |
| 4800719 | Exhaust system An exhaust system is provided for internal combustion engines which relatively improves the performance of such engines. The system comprises a plurality of approximately equal length exhaust pipes which are operably flow connected to exhaust ports of the... | 01/31/1989 |
| 4800720 | Exhaust system for internal combustion engine In order to prevent the formation of a standing wave in the exhaust system one or more small transfer passages are formed either inthe body of the manifold or in the cylinder head. These passages permit exhaust pressure to be transmitted to the exhaust po... | 01/31/1989 |
| 4800721 | Force feedback lever A control lever is provided for effecting positional control of a work implement. An actuator means applies a force to the control lever in response to a sensed load being applied to the work implement. The force applied to the implement control lever is ... | 01/31/1989 |
| 4800722 | Method and equipment for converting thermal energy to mechanical energy A thermal power machine is provided which converts thermal energy from a heat source to mechanical energy. A metal alloy member of predetermined length is provided which expands below a predetermined temperature and contracts back to the predetermined len... | 01/31/1989 |
| 4800723 | Electrically-driven opposed flexible bellows pump and position-controlled opposed flexible bellows jack system A flexible bellows connecting device which positions an output member has a pair of jacks (1,2) equipped with deformation sensors (12,13). A pair of variable capacity bellows pump reservoirs (3,4) permit predetermined motion of the jacks. An electric moto... | 01/31/1989 |
| 4800724 | Brake booster device providing pressure to both pressure chambers of tandem brake master cylinder device This brake booster is for a vehicle whose tandem type brake master cylinder has a first piston and a second piston operating in tandem, with first and second pressure chamber and a reservoir chamber for the second brake fluid supply pressure chamber being... | 01/31/1989 |
| 4800725 | Vehicle master brake cylinder assembly bleeding device A device is provided for bleeding entrapped gas from a master brake cylinder assembly when the latter is removed from a vehicle or prior to the assembly being installed in the vehicle and all of the outlet ports of the assembly are plugged. The device inc... | 01/31/1989 |
| 4800726 | Turbo compound engine A turbo compound engine including driving power transmission means for drivingly connecting a crankshaft of the engine to a power turbine provided in an exhaust gas passage, so as to secure an adequate braking force, which is relatively weakened by an imp... | 01/31/1989 |
| 4800727 | Energy conversion system involving change in the density of an upwardly moving liquid A system for converting thermal energy into electrical energy includes a fluid reservoir, a relatively high boiling point fluid such as lead or a lead alloy within the reservoir, a downcomer defining a vertical fluid flow path communicating at its upper e... | 01/31/1989 |
| 4800728 | Method and apparatus for gas flow control in a cryogenic freezer Method and apparatus for controlling gaseous cryogen flow through a continuous tunnel type freezer wherein the cryogen and product to be frozen travel in counterflow heat exchange relation to minimize egress of cryogen from, or ingress of ambient air into... | 01/31/1989 |
| 4800729 | Thermo-hygrostatic refrigerators A thermo-hygrostatic refrigerator has a cabinet defining a storage room for cooling and storing food materials therein, a refrigeration unit composed of a compressor, a condenser, an evaporator and other refrigeration systems, a brine tank storing brine t... | 01/31/1989 |
| 4800730 | Arrangement for influencing the speed of a compressor of a refrigerating system The V-belt drive (30, 32) between a drive engine (M) and the compressor (10) is constructed as V-belt drive of infinitely variable transmission ratio having at least one cone pulley pair (20). Connected to the evaporator (14) is a pressure line (24) via w... | 01/31/1989 |
| 4800731 | Icemaker An icemaker includes a motor and a gear train enclosed in a drive housing, a square drive output shaft extending from the housing, an output gear attached to the shaft, a camstack rotatable on a camshaft, and an input gear attached to the camshaft and dri... | 01/31/1989 |
| 4800732 | Refrigeration compressor with dual voltage hookup A compressor driven by a three phase electric motor is contained within a housing that is filled with refrigerant and is hermetically sealed with a terminal board. The terminal board has three electrical feedthrough terminals for coupling three of the mot... | 01/31/1989 |
| 4800733 | Refrigeration system for freight vehicles A refrigeration system for freight vehicles having inwardly open profiling for air ducting in the floor, the side walls and the doors, the profiling in the region of the vertical walls and doors being formed of vertically extending grooves or channels. In... | 01/31/1989 |
| 4800734 | Room air conditioner A room air conditioner unit is disclosed having a molded polymeric chassis consisting primarily of two chassis members. A sheet metal wrapper is removably installed with four corner fasteners and gives an external appearance of a metal unit, as well as as... | 01/31/1989 |
| 4800735 | Fan motor assembly method and apparatus for a room air conditioner The intermediate partition of a room air conditioner is provided with a downwardly extending slot in its upper edge such that installation and removal of the motor, with its attached fans, can be easily accomplished without removal of the partition. A fil... | 01/31/1989 |
| 4800736 | Heat pump A heat pump having reversible heating and cooling cycles for circulating a refrigerant therein for adding heat to and removing heat from space, the heat pump comprising a heat exchanger for adding heat to and removing heat from air passed over it, a conde... | 01/31/1989 |
| 4800737 | Automotive air conditioning system accumulator with refrigerant processing cartridge including evaporator pressure regulator An accumulator for use in an air conditioning system for an automotive vehicle includes a refrigerant processing cartridge with an outer casing, a desiccant, a filter, a separator, and a regulator for controlling the pressure of the refrigerant within the... | 01/31/1989 |
| 4800738 | Gem setting A gem setting includes a holding body and a gem received therein in a predetermined position, an inner wall face forming a part of the holding body and defining a bore hole therein; a first depression in the inner wall face; and a second depression in a p... | 01/31/1989 |
| 4800739 | Patterning mechanism for knitting machines A patterning device for a circular knitting machine which is particularly adapted for quick style changes. The device comprises a rotor element with a plurality of lobes around the periphery thereof, a drive motor for rotating the rotor element in synchro... | 01/31/1989 |
| 4800740 | Rotary switch apparatus for cycle selection on an automatic washing machine On a rotary switch apparatus for the cycle selection on a washing machine, the cycle data are arranged in a circular fashion around the rotary switch. Variable adjustable temperature ranges are assigned to each wash cycle, so that appropriate temperature ... | 01/31/1989 |
| 4800741 | Electrically and manually operable door lock with convenient backset selection A rim lock which includes a housing, a bolt displaceable in the housing, a strike which receives the bolt, a solenoid which is mounted on the housing and has a coil, a plunger which is axially reciprocal in the coil, a crosspiece fin which is disposed bet... | 01/31/1989 |
| 4800742 | Rolling mill for making a rolled product, especially rolled strip During operation of a rolling mill the roll gap and roll shape change, because of the influence of heat, bending of the working rolls or the roll mounting, wear and the like, and must be compensated and/or balanced to make a planar product, particularly a... | 01/31/1989 |
| 4800743 | Method and apparatus for accommodating thermal expansion and other variances in presses A method of controlling the spacing between a material forming punch and a complemental die includes advancing a punch shell and a pressure sleeve into engagement with the material and holding the material with the sleeve and blanking it with the punch sh... | 01/31/1989 |
| 4800744 | Production of a taper rod A tapered rod producing process by which a tapered rod having a profile very near to an aimed profile can be produced with high accuracy. According to the process, during working of a wire diameter gradually decreasing portion of a tapered rod in which th... | 01/31/1989 |
| 4800745 | Spur gear automatic production process The present invention relates to a spur gear automatic production process wherein spur gears are cold-press formed. The invention provides a top and bottom table with stock fed therebetween in sequential operation with the vertical stroke of the press mac... | 01/31/1989 |
| 4800746 | Machine and method for making star shaped fasteners A wire straightener, and multiple preform rollers prepare a continuous length wire for further forming with multiple form rollers having multiple spaced apart notches on an exterior surface edge of the rollers. The notches cause a section of the wire to b... | 01/31/1989 |
| 4800747 | Method of measuring oxygen in silicon A heat melting type gas extraction apparatus is employed to measure oxygen in a silicon sample. A double graphite crucible is first heated, in the absence of the sample or a flux metal, to extract oxygen therein. The flux metal is then added to the crucib... | 01/31/1989 |
| 4800748 | Method and apparatus for testing rail vehicle wheels The invention provides a method and an apparatus for testing wheel-sets of ail vehicles under loading conditions resembling those occurring in service, in which radial and/or axial forces are introduced into the wheel via the contact point of the wheel and... | 01/31/1989 |
| 4800749 | Transducer calibration circuit A calibration circuit in which low valued resistors are respectively connected in series with transducer outputs and switching means are provided for connecting resistors in the circuit so as to produce a voltage across the low valued resistor that corres... | 01/31/1989 |
| 4800750 | Device for accurately displacing fluid A device for accurately displacing a fluid within a chamber. The device includes a barrier wall (38) which separates the fluid (12) to be displaced from another fluid, a rod (32) and a concentric elastomeric tube (34) disposed about the rod and passing th... | 01/31/1989 |
| 4800751 | System for detecting load applied to suspension A system for detecting a load applied to a suspension assembly includes a strain gauge integrally provided on a component of an insulator member of the suspension assembly. The load is detected by a detecting circuit comprising a Wheatstone bridge formed ... | 01/31/1989 |
