Ronald H Beerbaum

US Patent:

51275759, Jul 7, 1992

Filed:

Apr 15, 1991

Appl. No.:

7/685199

Inventors:

Ronald H. Beerbaum - Southbury CT

International Classification:

F23N 520

US Classification:

236 46R

Abstract:

A supervisory control unit for lighting, heating and air conditioning equipment containing an occupancy sensor, a temperature limit detector, an entry delay detector and incorporating time cycle operation intended to limit the use of said equipment for the purposes of energy conservation. The unit outputs low voltage control signals that by means of external switching devices makes or interrupts the power and/or control signals normally connected to the lighting, heating and air conditioning equipment, thereby limiting the use of said equipment unless certain criteria are met.

US Patent:

43843565, May 17, 1983

Filed:

Apr 3, 1981

Appl. No.:

6/250859

Inventors:

Ronald H. Beerbaum - Southbury CT

Assignee:

Britsol Babcock Inc. - Waterbury CT

International Classification:

H03H 738

US Classification:

375 36

Abstract:

A method and apparatus are described for coupling a high-speed data communication modem to a communication line such as a coaxial cable with minimal transmission losses when the modem is not transmitting data. The transmitter coupling apparatus comprises a transformer, first and second transistors, biasing circuits for each of the transistors and a low-pass filter. The data signal to be transmitted is applied to the first transistor which is biased for linear amplification when data are being transmitted and for saturation when data are not being transmitted. The output of the first transistor is applied to the primary winding of the transformer where it is coupled to the secondary winding which is connected in series with the central conductors of the coaxial transmission line. When saturated, the first transistor grounds the winding terminal to which it is connected. The second transistor is biased so as to couple a power supply through the low-pass filter to the other terminal of the primary winding when data are being transmitted and to be non-conducting when data are not being transmitted.