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:
Jun. 11, 1991
Filed:
Oct. 03, 1989
Eugene L West, Grand Rapids, MI (US);
Robert J Marcinkewicz, Plainwell, MI (US);
Bradford-White Corporation, Philadelphia, PA (US);
Abstract
A method of insulating a water heater with an expandable foam insulating material is provided. The expandable foam insulating material has an initial viscosity of<300 cps, a flow index.gtoreq.about 0.7, a gel index.gtoreq.about 0.8 and generates a maximum pressure of.ltoreq.about 1.0 psig. The foam is injected into the annular space between the water tank and the outer jacket. Preferably, the foam is injected into a sleeve, which acts to confine the foam during its most liquid state, positioned within this space. The foam is preferably injected into the annular space between the tank and the jacket while the top cover is removed. In this way, the injected foam can be distributed more evenly around the circumference of the tank.