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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 7323956 | Electrical switching apparatus and trip unit including one or more fuses A circuit breaker includes a circuit breaker frame and a trip unit. The circuit breaker frame includes a housing, a line terminal, a load terminal, separable contacts electrically connected between the line terminal and the load terminal, an operating mechanism stru... | 01/29/2008 |
| 7245473 | Switchable lightning arrester system The switchable lightning-arrester system has a safety-switchable connector (10), which, for differing power-line features, can include optionally a counter-lever safety connector (14), a slide safety connector (40), a hinged safety connector ( | 07/17/2007 |
| 6998954 | Fused electrical disconnect device A fused electrical disconnect device comprises a housing and line and load connectors extending from one side of the housing. A line buss is disposed within the housing and is electrically connected to the line connector. A load buss is also disposed within the hous... | 02/14/2006 |
| 5041808 | Double load break switch and circuit A multi-pole load break switch having two sets of contacts in each pole connected in series to isolate its fuse. Also disclosed is a circuit incorporating the switches of the invention in a double-ended switch board having two power supplies normally isol... | 08/20/1991 |
| 4857896 | Polyphase circuit fuse condition indicating device A polyphase circuit fuse condition indicating device includes three substantially identical circuits forming a Y-connection across each fuse through first and second leads. Each circuit has an indicator light and a switch with resistors in the leads. The ... | 08/15/1989 |
| 4806898 | Polyphase interrupter responsive to single phase fault A polyphase interrupter includes an electric fuse in series with each phase, a phase grounding conductor electrically connected with each phase and movably mounted adjacent and electrically connected with a terminal of each fuse, biasing means arranged to... | 02/21/1989 |
| 4496916 | Switch fuse unit A modular switch-fuse unit is provided which can be engaged via terminals 26 with a busbar supply system. The unit is divided into a switch compartment 14 and a fuse compartment 16, the latter having an access door 36 which is normally blocked by operatin... | 01/29/1985 |
| 3952273 | High voltage switch mechanism Disclosed is an interrupter switch mechanism for interrupting current flow in a high voltage electrical circuit. A tubular switch blade is mounted for linear movement to engage and disengage a stationary contact. A spring is positioned within the hollow i... | 04/20/1976 |
