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| Number | Title | Issue Date |
| 3981317 | Flame-arresting or smoke-clearing valve device operating by closure and opening respectively The valve device adjustably controls air flow through a mechanical ventilation duct, blocks propagation of flames through the duct, and selectively exhausts smoke through the duct. An air extraction terminal sleeve communicates with the ventilation duct a... | 09/21/1976 |
| 3981316 | Pressure and temperature-responsive control means Actuator means of the pressure- and/or temperature-responsive type are disclosed for controlling valve means which supply pressure fluid (such as a combustible gas) to a load (such as a gas-fired boiler), characterized in that the actuator means are opera... | 09/21/1976 |
| 3970104 | Fuel filter bypass valve with condition preliminary indicator and secondary indicator A fuel filter bypass valve assembly includes a valve body having inlet and opposite sides. A movable member is peripherally sealed to the opposite side, and moves toward and away therefrom to define a variable volume chamber. Port means extends past the v... | 07/20/1976 |
| 3960124 | Pollutant emission control system and a combined electric switch and temperature responsive valve thereof Improved pollutant emission control system and a combined electric switch and temperature responsive valve therefor as utilized in an internal combustion engine wherein a specially arranged electric switch and valve of the combined switch and valve is res... | 06/01/1976 |
| 3949963 | Bottom drain valve construction A bottom drain valve comprises a housing with an upper tubular portion with a top drain opening and an annular valve seat around the drain opening. The drain discharge connects laterally downwardly from the lower part of the upper tubular portion. A valve... | 04/13/1976 |
| 3947758 | Disc thermostat test system and method The disclosure relates to a system and method whereby bimetallic discs as well as a completed thermostat can be dynamically tested non-destructively. The bimetallic disc can be tested by utilizing its magnetic properties, the magnetic properties of the di... | 03/30/1976 |
| 3942551 | Hydraulic damping means for hinged check valve An improved hydraulic control means for check valves to prevent slamming of a clapper against a seat. The clapper of the check valve is connected via a crosshead to an hydraulic cylinder and a piston contained therein controls the closing of the check val... | 03/09/1976 |
| 3938329 | Exhaust gas detoxication system for a motor vehicle combustion engine An exhaust gas detoxication system for a motor vehicle combustion engine with external ignition includes an air pump driven by the engine to deliver secondary air into the exhaust system. The exhaust system contains a thermal reactor wherein final combust... | 02/17/1976 |
