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. 16, 1991
Filed:
Jul. 02, 1990
Applicant:
Inventors:
Ronald M Herrington, Brazoria, TX (US);
Robert B Turner, Lake Jackson, TX (US);
Robert M Harnden, Granville, OH (US);
Assignee:
The Dow Chemical Company, Midland, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
521 99 ; 521174 ; 521918 ; 528 44 ; 528 76 ; 528502 ; 528503 ;
Abstract
Polyurethane foams having a specified glass transition temperature are densified for transportation or other purposes by heating the foam to a temperature above its T.sub.g, compressing the heated foam, and then cooling the compressed foam to a temperature below its T.sub.g. The cooled foam remains in a densified state until re-heated to a temperature above its T.sub.g, whereupon it re-expands to assume its original dimensions.