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| Number | Title | Issue Date |
| 3955183 | Alarm condition sensing and indicating circuit with test capability An alarm circuit includes an alarm condition indicating section having an alarm indicator, such as a lamp, and a power supply therefor, the lamp becoming illuminated in response to sensing of an alarm condition. Also included is an alarm condition sensing... | 05/04/1976 |
| 3946573 | Electrical diagnostic system for refrigeration apparatus A diagnostic system for use with refrigeration apparatus and the like for selectively indicating the operability condition of different electrical components thereof. The indicating apparatus is mounted to the refrigeration apparatus and includes a select... | 03/30/1976 |
| 3943499 | Portable fire detector A portable fire alarm device comprising fire detecting means and alarm means powered from a self-contained power supply. The power to the detector and alarm is through a normally closed switch of the type such as a mercury switch which may be opened by ti... | 03/09/1976 |
| 3939398 | Indicator lamp circuit having feedback protection A circuit, having protection against current feedback when a component fails, for testing indicator lights whereby multiple lights may be tested simultaneously by pressing one pushbutton and closing one set of normally open contacts. The test pushbutton a... | 02/17/1976 |
| 3932853 | Apparatus for warning of the failure of a sump pump Apparatus for warning of the failure of a sump pump comprising an electrical alarm connected in an electric circuit, a switch for closing the circuit to activate the alarm, and a movable float positioned in the sump for actuating the switch when the water... | 01/13/1976 |
