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"Transmission of documents via telephone wires is possible in principle, but the apparatus required is so expensive that it will never become a practical proposition."
Dennis Gabor, British physicist
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| Number | Title | Issue Date |
| 4194194 | Piezoelectric vibration detector for sensing a nearby intruder An intrusion sensor uses thin film piezoelectric transducers to sense nea mechanical vibrations. A hose-like sheath contains a pair of insulating strips which carry conductive leaves on their outer surfaces. A series of longitudinally arranged segments o... | 03/18/1980 |
| 4091369 | Collision-responsive alarm with a rotating reflector and warning light A housing contains a rotating reflector and incandescent lamp in a transparent upper part. An impact-responsive switch in a base of the housing turns on the lamp and a motor to rotate the reflector. Fan blades on the reflector pull cooling air through inl... | 05/23/1978 |
| 4067005 | Invalid bed system An alarm system for an invalid in a hopsital bed includes electric switches placed on top of the side rails and foot rail so that a force applied to any of said switches by a patient results in activation of a warning device. In addition, means is provide... | 01/03/1978 |
| 4058792 | Ship security system A security system for a floating structure such as a boat, or the like, and which comprises an electro-mechanical apparatus that is sensitive to substantial changes in the position or orientation of the floating structure. A sensor circuit means is employ... | 11/15/1977 |
| 4037223 | Audible alarm system for an electrical outlet An audible alarm system for an electrical outlet including a housing dimensioned to prevent access to the socket of an electrical outlet upon insertion therein, means coupled to the housing for insertion into a socket, alarm means in the housing for provi... | 07/19/1977 |
| 4020453 | Sensing system for actuating a safety device An acceleration sensing and safety-device actuating system, for actuating a safety device, such as a crash-sensitive automobile air bag detonator. A differential amplifier forms part of an operational integrator responsive to an acceleration sensor and a ... | 04/26/1977 |
| 3980318 | Fused multiple stage inflation system A vehicle safety system of the kind incorporating a crash activated safety device, such as an inflatable passive passenger restraint, and electro-explosive devices responsive to an electric current of preselected minimum amplitude and duration from an ele... | 09/14/1976 |
| 3967262 | Line integrated combination magnetic and strain line sensor The disclosed invention pertains to an intruder detection system incorporng paired sensors with minimum sensor balance restraints. The sensor requires as few as three generally parallel trenches and an end trench and thus is suitable for installation by ... | 06/29/1976 |
| 3949357 | Operation recorder for motor vehicle safety device An operation recorder to record a malfunction of a safety device or to record a proper function of the safety device comprises an AND-output gate. The AND-output gate is connected at its input side with the outputs of first and second monostable-multivibr... | 04/06/1976 |
| 3945704 | Device for detecting an applied compressive load A one-shot device for detecting the application of a compressive load of predetermined amount which includes a first and a second electrically conductive metallic member, each of which has a substantially planar face. The first member is made of a materia... | 03/23/1976 |
