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:
Feb. 17, 2004
Filed:
Jan. 25, 2002
Applicant:
Inventors:
Donald E. Morris, Laguna Beach, CA (US);
Robert L. Wheeler, Monrovia, CA (US);
Assignee:
Acorn Engineering Co., Inc., City of Industry, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F24H 1/10 ;
U.S. Cl.
CPC ...
F24H 1/10 ;
Abstract
An antifreeze heating system which prevents the freezing of water present in an instant water heater of the type having a primary heater which remains inactive under static flow conditions. A secondary heater is placed within an enclosed housing volume of the instant water heater, and electrically connected to a temperature-sensitive switch which activates the secondary heater when a monitored temperature, such as the ambient temperature, falls below a threshold value.