Gerald H Hoffman

US Patent:

40601234, Nov 29, 1977

Filed:

Sep 27, 1976

Appl. No.:

5/726977

Inventors:

Gerald F. Hoffman - Excelsior MN
Dewayne P. Bolton - Memphis TN

Assignee:

Fabri-Tek Incorporated - Minneapolis MN

International Classification:

G05D 2324
F05B 6500

US Classification:

165 11

Abstract:

An improved energy saving control apparatus particularly designed for providing energy saving control of individual room heating and cooling units in direct response to the active occupancy status of the room. Switching means selectively interrupt energization of the load element of a room heating/cooling unit in response to an interrupt control signal. An electronic energy saving control circuit responds to changes in the ambient air room temperature and overrides the heating/cooling unit thermostat to selectively generate the interrupt control signal for maintaining the ambient air room temperature within a broad predetermined and pre-settable energy saving temperature range whenever the room is not actively occupied. Occupancy status detector means, including a uniquely detectable and detachable member typically carried by the room occupant and cooperative detector means within the room provides a real time indication of the active occupancy status of the room. Circuit means responsive to the detected occupancy status overrides the electronic energy saving control circuit whenever the room is actively occupied, causing the heating/cooling unit thermostat to regulate the ambient room air temperature within a narrow settable comfort temperature range.

US Patent:

D2505762, Dec 19, 1978

Filed:

Mar 21, 1977

Appl. No.:

5/779812

Inventors:

Gerald F. Hoffman - Excelsior MN

Assignee:

Fabri-Tek Incorporated - Minneapolis MN

International Classification:

D1004

US Classification:

D10 60