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. 24, 2001
Filed:
Jul. 10, 2000
Applicant:
Inventor:
Larry James Burkhart, Indianapolis, IN (US);
Assignee:
Carrier Corporation, Farmington, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F25B 4/702 ;
U.S. Cl.
CPC ...
F25B 4/702 ;
Abstract
In a time and temperature controlled defrost cycle for a heat pump system, defrost cycles are controlled by two variables: elapsed time since the last defrost cycle, and the refrigerant temperature in the outdoor coil. The elapsed time variable for the first defrost cycle after power-up is set less than the elapsed time variable required for subsequent defrost cycles. Thus, the system is not vulnerable to planned cyclical power outages if the power outage cycle time is less than the elapsed time variable required between regular defrost cycles.