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:
Aug. 27, 1991
Filed:
Aug. 03, 1990
Applicant:
Inventor:
William J Lund, Stockton, CA (US);
Assignee:
Metlund Enterprises, Stockton, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K / ;
U.S. Cl.
CPC ...
137337 ; 126362 ; 417 32 ;
Abstract
A demand recovery hot water system in accordance with the present invention provides for return of hot water from a plurality of plumbing fixtures to a hot water source. A transfer tank is provided with a movable piston which enables circulation of hot water without significant loss thereof. Continuous circulation is not required thus reducing operating costs.