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 |
| 6998961 | Alarm clock with voice message input The subject device is an alarm mechanism having a voice message or other sound input wherein the mechanism incorporates a taping mechanism to receive and store voice or other audio sounds to be subsequently or simultaneously projected audibly as a signal to awaken t... | 02/14/2006 |
| 5477205 | Combination outside light and audible/visual alarm An alarm system incorporates a three-position wall switch which replaces a conventional two position switch, connected in circuit with a conventional exterior light fixture. The conventional light bulb in the exterior fixture is replaced by an adapter to ... | 12/19/1995 |
| 4959636 | Search head for metal detectors A search head for a metal detector, the head comprising a support body and three conductive loops mounted on the body, the loops being formed from a single ribbon cable. An oscillating signal is applied to one of the loops and induced voltages in the othe... | 09/25/1990 |
| 4518946 | Audio-visual alarm device with translucent cover An alarm device comprises a bell alarm 12 and a flashing light warning means 11, both encased in a housing 13 formed of translucent material. The device of the invention incorporates both an audible and visual alarm means in a single device and electrical... | 05/21/1985 |
| 4462030 | Electronic apparatus with audible annunciator and alarm lamp A portable electronic apparatus has an oscillator for generating a signal. An audible annunciator has an inductance element for generating an audible annunciating signal in response to a first actuation signal of a first frequency. A light emitting means ... | 07/24/1984 |
| 4255747 | Sump pump level warning device A battery operated sump well fluid level warning device is provided which is secured to the discharge line extending out of the sump well from a submersible sump pump. A first housing having a battery power source and a float actuated switch disposed ther... | 03/10/1981 |
| 4253083 | Traffic signal system for blind people A traffic signal system for blind people which can be combined with an existing traffic signal device the device having a sound signal generator electrically connected to a blue light of the pedestrian traffic signal device for generating a signal represe... | 02/24/1981 |
| 4241332 | Personal security alarm A personal security alarm including a loud speaker powered by an audio frequency signal generator to produce a siren effect and a high intensity flashlamp, both of which are activated upon operation of a remote switch and can be deactivated only by a key ... | 12/23/1980 |
| 4225852 | Patient care timer A resettable timer conformed as an interface assembly between a nurse call button and the wall jack therefor, including a D.C. power supply driving a timing circuit which closes a switch in parallel with the call button at the completion of a predetermine... | 09/30/1980 |
| 4225853 | Controller for signalling system A signalling device for use in a public transportation vehicle. The signalling device includes a cord, or other device by which a passenger on the vehicle can signal the driver, and a device for generating a signal, normally a buzzer. A control circuit se... | 09/30/1980 |
| 4100537 | Monitor for gas piping system Apparatus for monitoring the pressure in a gas line and providing a visual and audible indication of a high or low pressure condition, the gas line having a pressure sensor for generating high and low pressure signals, comprising a visual indicator respon... | 07/11/1978 |
| 3984825 | Condition monitoring apparatus Alarm apparatus for providing a distinctive indication of an alarm condition and comprising a visual alarm device such as a signal lamp and also an aural indication device comprising either a bell or buzzer. In response to an alarm input, an astable multi... | 10/05/1976 |
