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| Number | Title | Issue Date |
| 5944257 | Bulb-operated modulating gas valve with minimum bypass A multi-way valve unit which provides low pressure unregulated gas flow and high pressure regulated gas flow in an integrated gas control system. A main and bypass diaphragm valves control gas flow through the gas valve system, the main and bypass valves ... | 08/31/1999 |
| 4627569 | Four function pneumatic controller A pneumatic controller for use in controlling airflow in a conditioned air distribution system is adjustable to accommodate different types of damper actuation and thermostats in different systems. The four-function controller can be manually reconfigured... | 12/09/1986 |
| 4323112 | No energy band temperature control A system for controlling the temperature of an enclosed volume includes a pneumatic thermostat, heating means and cooling means. The thermostat has two entirely independent controls: a heating control and a cooling control. Both controls remain independen... | 04/06/1982 |
| 4076171 | Damper control apparatus An apparatus for opening and closing the draft hood discharge opening and vent and fuel line of a fluid fuel-fired heating device such as a domestic water heater. The disclosed apparatus includes a diaphragm-type expansible chamber fluid motor assembly po... | 02/28/1978 |
| 4019678 | Mixing valve A mixing valve wherein a body provides plural inlets and a common outlet, with a valve settable to control flow from the inlet to a mixing chamber communicating with the outlet. A fluid pressure operated piston means adjusts the valve in its control posit... | 04/26/1977 |
| 3997107 | Servo modulating regulating control system A servo valve control system exemplified by way of temperature controlled gas valves. Multiple slave pressure regulating valves are utilized supplying multiple burner manifolds. The first valve of the group of valves is modulated in response to temperatur... | 12/14/1976 |
| 3980229 | Temperature controlled regulator A temperature controlled regulator in which valved air inlets communicated with air pressure sources at different temperatures control the flow of air into a mixing chamber to maintain the outlet temperature of the mixture within specified limits, said re... | 09/14/1976 |
| 3934795 | Dual duct variable volume air conditioning system A dual duct variable volume air conditioning system has a first, cold duct for supplying cold air and a second, reset duct for supplying either hot air in a first mode of operation or cold air in a second mode of operation. A self-contained system regulat... | 01/27/1976 |
