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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 |
| 6922131 | Electrical device An electrical device suitable for use in digital telecommunications applications is provided. The device includes a laminar PTC element composed of a conductive polymer composition sandwiched between two metal foil electrodes. A first insulating layer which is compo... | 07/26/2005 |
| 6882264 | Electrothermal self-latching MEMS switch and method Electrothermal Self-Latching MEMS Switch and Method. According to one embodiment, a microscale switch having a movable microcomponent is provided and includes a substrate having a stationary contact. The switch can also include a structural layer having a movable co... | 04/19/2005 |
| 6737952 | Combined pressure responsive electrical switch and temperature sensor device A combined pressure responsive electrical switch and temperature sensor device (10, 10′) is shown comprising a base member (12) mounting an electrical switch actuatable by a pressure responsive snap-acting disc (16) attached to a port fitting ... | 05/18/2004 |
| 6472971 | Circuit breaker A circuit breaker includes main circuit contact shoes disposed in a circuit breaker case and urged by a contact spring, a contact opening and closing mechanism located above the contact shoes and including an opening and closing lever, a toggle link, an o... | 10/29/2002 |
| 6157286 | High voltage current limiting device A high voltage, current limiting device is connected in series with a high voltage power source and a protected load to interrupt current for an over-current condition [Typically 50 kA]. The current limiting device includes a current sensor/isolator and a... | 12/05/2000 |
| 6154115 | Overcurrent release device An overcurrent release device for protection switching devices, in particular automatic line circuit breakers or motor protective switches, with electromagnetic and thermoelectric release, includes a thermoconducting tubular supporting body onto which a c... | 11/28/2000 |
| 6133816 | Switch and relay using shape memory alloy A novel shape memory alloy electrical switch is disclosed, including both momentary and especially a latching relay. The switch/relay disclosed is particularly useful in low power control of appliances, including i.a. refrigerators. Used with a microproce... | 10/17/2000 |
| 6049267 | Adaptive control module using shape memory alloy A novel shape memory alloy electrical switch is disclosed, including both momentary and especially a latching relay. The switch/relay disclosed is particularly useful in low power control of appliances, including i.a. refrigerators. Used with a microproce... | 04/11/2000 |
| 6016096 | Control module using shape memory alloy A novel shape memory alloy electrical switch is disclosed, including both momentary and especially a latching relay. The switch/relay disclosed is particularly useful in low power control of appliances, including i.a. refrigerators. Used with a microproce... | 01/18/2000 |
| 5990777 | Shape-memory wire actuated switch A switch (10) is provided that has a housing (12), an actuator (20), a contact blade (18), first and second shape-memory wires (28,30), and first and second contact points (70,71). The actuator (20) has a first end portion (52) pivotally coupled to the ho... | 11/23/1999 |
| 5977858 | Electro-thermal bi-stable actuator An actuator that uses electrothermal energy to switch between a first latching position and a second latching position. The actuator contains a leaf spring capable of latching into two distinct positions and two shape-memory wires. The shape-memory wires ... | 11/02/1999 |
| 5973585 | Overcurrent trip for circuit breakers An overcurrent trip (1) for circuit breakers or motor safety switches has a very short reaction time. The short reaction time is achieved by connecting a bimetal snap-action disk (8) to the heating device (7) in such a way that its central region is alway... | 10/26/1999 |
| 5939968 | Electrical apparatus for overcurrent protection of electrical circuits An electrical apparatus comprising first and second PTC elements composed of a polymer composition with conductive particles dispersed therein, an insulating body, and first and second conductive terminals. Flexible conductive members having a first end t... | 08/17/1999 |
| 5907270 | Current-limiting switch A current-limiting switch, with current connections and contacts, at least one of which is movable, having an associated drive, for opening the moving contact when a predefined electric current intensity is exceeded, are provided. The drive is a thermoele... | 05/25/1999 |
| 5854582 | Pivotal latching mechanism with interengageable latch arm and catch in a sectionalizer assembly A sectionalizer assembly includes a mounting structure having upper and lower electrical contacts, a sectionalizer tube, an actuating member mounted to the tube and movable from a non-actuated to an actuated position, and a pivotal latching mechanism havi... | 12/29/1998 |
| 5808538 | Electrical apparatus for overcurrent protection of electrical circuits An electrical apparatus comprising first and second PTC elements composed of a polymer composition with conductive particles dispersed therein, an insulating body, and first and second conductive terminals. Flexible conductive members having a first end t... | 09/15/1998 |
| 5796569 | Cylindrical PTC circuit overcurrent protection device A self-resetting circuit overcurrent protection device suitable for use as a replacement for a conventional cylindrical fuse has at least one semi-tubular positive temperature coefficient (PTC) element surrounded by a tubular, electrically insulating body... | 08/18/1998 |
| 4227169 | Combined thermal and electrical cut-off device The device described herein is useful in applications which formerly required both a thermal cut-off device and an electrical fuse. This device will open an electrical circuit in response to either an increase in ambient temperature or an increase in elec... | 10/07/1980 |
