Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 4349208 | Unitary ski-sled A ski-sled preferably formed of a single, unitary piece of molded plastic, resulting in a lightweight, durable, inexpensive and readily mass-produced item. The unitary ski-sled consists of three major components: an elongated runner, a seat, and specially... | 09/14/1982 |
| 4348668 | System for controlling power distribution to customer loads A method and apparatus which permits a power utility to have direct control of customers loads (CD) with a view toward facilitating enablement of a load management philosophy which includes peak shaving and load deferral. A master control station (MCS), w... | 09/07/1982 |
| 4347575 | System for controlling power distribution to customer loads A method and apparatus which permits a power utility to have direct control of customers loads (CD) with a view toward facilitating enablement of a load management philosophy which includes peak shaving and load deferral. A master control station (MCS), w... | 08/31/1982 |
| 4346432 | Rectifier controller responsive to sensed A.C. voltage signals A rectifier controller for controlling bridge connected silicon control rectifiers (SCRs) (1 to 6) of a three-phase rectifier which is used to supply a direct current (DC) voltage to an inverter (314) used for injecting pulse coded audio frequency signals... | 08/24/1982 |
| 4346421 | Fault detector A fault detector for detecting shoot-through conditions in series connected solid state rectifiers (326, 329) of a power inverter (314) is disclosed. A capacitor (311) discharges when a shoot-through occurs and the discharge current is detected by a curre... | 08/24/1982 |
| 4335530 | Shoe sole construction A shoe sole construction which features an outer sole (18) having at least one opening (26) through which a protrusion (30) of a less dense midsole (16) extends. The cutout area (26) of the more dense outsole (18) decreases the overall weight of the sole ... | 06/22/1982 |
| 4329997 | Cold/hot compression and elevation apparatus Compression and elevation apparatus particularly designed for use by an athlete immediately after sustaining a soft-tissue injury, and which also may be used during subsequent treatment of the injury. The apparatus comprises a substantially rectangular ta... | 05/18/1982 |
| 4328809 | Device and method for detecting the potential level of the electromagnetic field of a living organism A device and method for detecting the potential level of the electromagnetic field present between a reference point and a test point of a living organism is disclosed. A reference electrode provides a first signal indicative of the potential level of the... | 05/11/1982 |
| 4323868 | Setting mechanism for snap action circuit breaker A circuit breaker comprising an electrically insulating housing, an overcurrent sensor in the housing, a stationary and a movable contact in the housing, and a latch mechanism coupled to the movable contact. The latch mechanism is tripped in response to a... | 04/06/1982 |
| 4318870 | Distillation plate A baffle system for use on a plate for mass transfer operations comprises at least one channel, the surface of the channel through which a two-phase mixture of liquid and vapor leaves the channel having a plurality of holes. A deflector is immediately adj... | 03/09/1982 |
| 4314737 | Cable assembly having shielded conductor and method of making same A cable assembly having a shielded conductor and a method of making same. The shielded conductor is formed by bonding a thin layer of conductive material to the outer surface of an insulated wire. The bonding may be achieved by coating the outside surface... | 02/09/1982 |
| 4308421 | EMF Controlled multi-conductor cable A multi-conductor transmission cable which includes a plurality of parallel conductors each of which may be insulated with a relatively low loss, high velocity of propagation material. The insulations surrounding an adjacent conductor pair may be joined b... | 12/29/1981 |
| 4307882 | Ball game for indoor use A ball game for indoor use comprising a playing surface or a court, a netting, rackets or bats, and a ball. The length of the court is between 1.5 feet and 6.5 feet. Each racket has a handle arranged at an angle with respect to the striking face of the ra... | 12/29/1981 |
| 4303937 | Communication system for supplementing off-air or cable TV signals with locally generated video messages A communication system which supplements a hotel's in-house cable or off-air TV signal distribution network for permitting locally originated video messages, which may be commercial in nature, to automatically interrupt the regular TV signals on each of t... | 12/01/1981 |
| 4296462 | Inverter controller An inverter controller for controlling a three-phase inverter used for generation and subsequent injection of pulse code signals on power lines in a utility load management system is disclosed. The controller includes read-only-memory devices (208, 210) f... | 10/20/1981 |
| 4290274 | Liquid spray device with adaptive duty cycle An energy-saving device is disclosed which is particularly designed to control the temperature of the refrigerant in an air conditioning or refrigeration unit by evaporating a sprayed liquid on the refrigerant-containing vessels. The device may alternativ... | 09/22/1981 |
| 4283726 | Dual frequency distance measuring system A radio frequency distance measuring system and method where two continuous wave carrier signals, derived from a stable frequency source, are radiated from a known reference point. The frequency of the first continuous wave carrier signal is displaced fro... | 08/11/1981 |
| 4281212 | Cable assembly having shielded conductor A cable assembly having a shielded conductor; the shielded conductor is formed by bonding a thin layer of conductive material to the outer surface of an insulated wire. The bonding may be achieved by coating the outside surface of the insulated wire with ... | 07/28/1981 |
| 4278411 | Apparatus for making large fiberglass structures A completely self-contained apparatus and associated technique for the manufacture of large fiberglass structures. In a preferred embodiment, the system is designed to manufacture large fiberglass storage tanks for liquids, and is self-contained from the ... | 07/14/1981 |
| 4270764 | Noisemaker for skateboard A noise-making device which is particularly adapted to be utilized in conjunction with a skateboard or similar wheeled vehicle. The device comprises a ring-shaped component having one or two cylindrical projections extending from the outer peripheral edge... | 06/02/1981 |
| 4268807 | Band-pass filter and gain stage A band-pass filter and gain stage which produces a desired passband at a preselected center frequency. The present invention can be characterized as being a very passive frequency door whose output is lightly coupled to a broad band frequency amplifier ha... | 05/19/1981 |
| 4264960 | System for controlling power distribution to customer loads A method and apparatus which permits a power utility to have direct control of customers loads (CD) with a view toward facilitating enablement of a load management philosophy which includes peak shaving and load deferral. A master control station (MCS), w... | 04/28/1981 |
| 4262983 | Circuit board connector for insulated wire A connector and terminal for insulated wire which includes a pin section particularly adapted to extend through an aperture in a circuit board. The connector, which is formed of a single piece of electrically conductive metal includes a tubular section ad... | 04/21/1981 |
| 4260085 | Motorcycle ice chest An ice chest included in a container which is suitable for mounting upon a rear rack or carrier on a motorcycle. The container includes a second, separate compartment for containing dry goods which is positioned adjacent the ice compartment for maintainin... | 04/07/1981 |
| 4260036 | Powered ski An improved ski device which incorporates a power unit for providing forward thrust and which is capable of operation over water, snow, ice, artificial surfaces, or the like. In one embodiment, the unit utilizes an upright chassis which is articulated to ... | 04/07/1981 |
| 4257732 | Hay stacker An agricultural implement, such as a hay rake, may be easily and quickly connected to or disconnected from the tow bar of a tractor. The apparatus features a large main frame assembly which extends over top of the tractor to a ground-engaging position in ... | 03/24/1981 |
| 4255117 | Heat source for food warming unit A heat source which is particularly adapted to be utilized for a food warming unit or the like. The heat source includes a fuel tank which is adapted to be filled with a liquid fuel and includes a recessed chamber with one or a plurality of burner units d... | 03/10/1981 |
| 4252088 | Differential switch for detecting leaks A flapper is provided in the inlet and outlet lines to a domestic hot water heater or the like and a permanent magnet is affixed to the bottom portion of each of the flappers. Immediately adjacent each flapper and outside of the pipe, a magnetically opera... | 02/24/1981 |
| 4240433 | Fluid aspiration device and technique for reducing the risk of complications A device and technique utilized in body fluid aspiration which minimizes the risk of complications that normally may result from accidental puncture of internal organs. The device includes a sharp-tipped fluid aspiration needle which features cushioning m... | 12/23/1980 |
| 4237914 | Bed tent A portable folding tent which is adapted to be erected over a child's bed thereby enabling the child to camp out under a tent in his own bed. Several basic embodiments of the tent are provided. One has substantially rigid sides, while another includes a l... | 12/09/1980 |
| 4234764 | Long distance telephone call security system A self-contained electronic system which may be connected to either a standard dial telephone or push-button telephone for preventing use of the telephone for unauthorized long distance or toll calls. The system permits an authorized individual to key in ... | 11/18/1980 |
