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| Number | Title | Issue Date |
| 4690242 | Sound actuated switch A sound actuated detector comprising a microphone, an elastic cylinder having a flexible bottom adapted to fit tightly around the microphone with the sensing surface of the microphone fitting tightly against the flexible bottom, a mounting base connected ... | 09/01/1987 |
| 4678985 | Two-terminal line-powered control circuit A two-terminal line-powered control circuit is disclosed in which a triac is used to switch AC power to a load. When the triac is not conducting, a portion of the voltage appearing across it is rectified and filtered and used to supply power to a radio co... | 07/07/1987 |
| 4661080 | Toy racing set with exploding raceway A toy playset including a bridge which may be used in a road racing set to emulate the occurence of an explosion. The playset includes a launcher and a toy bridge with a track portion and an actuating device. The track portion includes at least one elemen... | 04/28/1987 |
| 4647794 | Solid state relay having non overlapping switch closures A solid state relay circuit is provided which controls the application of power to multiple loads in a manner which prevents the simultaneous application of power to more than one load. Photovoltaic diode arrays along with phototransistors are employed to... | 03/03/1987 |
