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| Number | Title | Issue Date |
| 4067004 | Remote personnel station alarm system A carbon monoxide Monitoring System includes a control panel and remote alarm stations. The control panel is associated with a carbon monoxide monitoring unit, an emergency AC power pack and an alarm system. Each remote alarm station includes a visual-aud... | 01/03/1978 |
| 4064498 | Electrical circuitry for detecting a combustible mixture of gas in a mine atmosphere A pair of sensor assemblies that change in electrical resistance when exposed to a mixture of combustible gas are positioned at a selected location in a mine or on a piece of operating equipment and receive power for continuous operation from a regulated ... | 12/20/1977 |
| 4045997 | Air curtain device This invention relates to a novel air curtain device suitable for use in detecting certain characteristic vapors emitted from objects, particularly individuals, positioned therein. An air curtain having a uniform velocity profile is set up between first a... | 09/06/1977 |
| 3984826 | Condition detector, especially for detecting atmospheric conditions In a condition detector for detecting conditions in more than a single region, a pilot flame is established by a controlled supply of fuel to a burner at the bottom of a vertically elongate chimney. The chimney is closed at the bottom and combustion air f... | 10/05/1976 |
| 3978476 | Circuit conduction test arrangement for emergency alarm systems Circuit conduction test arrangement for emergency alarm systems having a receiving panel for a group of several sections to be supervised and including common alarm means, and a plurality of relay panels installed in the respective sections; comprising in... | 08/31/1976 |
| 3972225 | Sampling system for power generators A sampling system monitors a gas stream of a power generator and automatically samples the gas stream if its characteristics indicate that a material in the power generator is being thermally degraded. A gas stream monitoring device generates a first sign... | 08/03/1976 |
| 3961900 | Combustible vapor detector Apparatus for detecting the presence of combustible vapors, e.g., natural gas, in the air utilizes an aluminum heat sink having a sealed reference chamber and a sensing chamber through which samples of air are continuously drawn. Separate unsupported plat... | 06/08/1976 |
| 3955268 | Method of fabricating an electrolytic cell gas sensor A Solid State Electrolytic Cell Gas Sensor is presented which is capable of measuring various toxic or combustible gases in low concentrations (0-5 PPM) up to and including high concentrations such as 0-20 percent by volume. The sensor exhibits excellent ... | 05/11/1976 |
| 3948202 | Ventilation control apparatus for an engine room of a ship A ventilation control apparatus includes a timer and a switch for operating the timer. When the timer is operated an engine room is ventilated and after a preset time, as timed by the timer the engine is automatically started.... | 04/06/1976 |
| 3935079 | Method and apparatus for displaying active oxygen and sensor temperature A method and apparatus for displaying the active oxygen content of a liquid metal and the sensor temperature of a probe from signals developed by the probe which is capable of being plunged directly into the liquid metal. The probe comprises a small mass ... | 01/27/1976 |
