The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 23, 1985
Filed:
Feb. 27, 1984
Donald E Janke, Benton Township, Berrien County, MI (US);
William J Linstromberg, Lincoln Township, Berrien County, MI (US);
Whirlpool Corporation, Benton Harbor, MI (US);
Abstract
An improved demand defrost control system for use in a refrigeration apparatus. The control system utilizes a temperature responsive switch for switching the apparatus between 'run' and 'defrost' conditions. The temperature responsive switch is arranged to have controlled heat transfer relationship with the cooling system, and in the illustrated embodiment, is mounted in spaced relationship to the evaporator in the flow path of the refrigerated air, and in a preselected insulating housing. A heater is provided for controlling the operation of the switch, and the control circuit is arranged to energize the heater upon termination of the defrost cycle to positively effect transfer of the defrost control switch back to the 'run' condition. The control circuit is energy-efficient and provides redundant switching control of the defrost heater to provide a fail-safe operation.