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"Flight by machines heavier than air is unpractical and insignificant, if not utterly impossible."
Simon Newcomb, astronomer ; Said in 1902, less than two years before the first flight at Kitty Hawk
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| Number | Title | Issue Date |
| 4092573 | Motor starting and protecting apparatus A combination starting and protecting device particularly useful with split phase motors such as those used with refrigeration compressors is disclosed in which an element of material having a positive temperature coefficient (PTC) of resistivity characte... | 05/30/1978 |
| 4087772 | Circuit breaker A high performance, manually and automatically operable, trip-free magnetic circuit breaker incorporates a housing having housing parts secured together by external mounting clips to achieve better electrical characteristics, to permit reliable assembly w... | 05/02/1978 |
| 4086558 | Motor protector and system A motor protector characterized by low cost, by improved service life and by improved cycling properties has a bimetallic element mounted in a metal housing to move a first contact along a selected axis to engage and disengage a complementary contact in r... | 04/25/1978 |
| 4086467 | Electronic heater for high voltage applications A high voltage, high efficiency self-regulating heater comprises a thermally conductive housing having a chamber therein with a heating member in the chamber. The heating member includes a self-heating positive temperature coefficient (PTC) resistor eleme... | 04/25/1978 |
| 4086451 | Keyboard apparatus A low profile keyboard having a flat cover to enhance appearance and facilitate cleaning. Tactile feedback of switch actuation is provided by using snap acting discs for the switches and tactile feedback members interposed between the discs and the cover.... | 04/25/1978 |
| 4085765 | Pressure relief valve A one-shot pressure relief device which can be hermetically sealed comprising a housing with a port fitting for connecting to a pressure zone to be monitored, the fitting having a passage which leads into a central cavity within the housing from the top s... | 04/25/1978 |
| 4085393 | Circuit breaker A high performance, manually and automatically operable, trip-free magnetic circuit breaker incorporates a magnetic actuation system with improved core, clapper and coil mounting to achieve more accurate and consistent breaker operation; incorporates a mo... | 04/18/1978 |
| 4084437 | Thermocouple circuit A thermocouple circuit has dissimilar conductors joined to form a conventional temperature transducer located in a zone to be monitored or controlled. The opposite ends of these conductors are connected to similar metal leads in a capsule located in a sta... | 04/18/1978 |
| 4083336 | Condition responsive control device A condition responsive control device is disclosed for affecting operation of a choke control in response to variable ambient and system temperatures, as well as the use of such a device in a system in which it is desired to adjust an operating parameter ... | 04/11/1978 |
