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:
Jan. 29, 1991
Filed:
Jul. 07, 1987
Applicant:
Inventors:
Sadao Kumasaka, Tokyo, JP;
Satomi Tada, Tokyo, JP;
Koretoshi Katsuki, Tokyo, JP;
Osamu Fujii, Konosu, JP;
Tutomu Yamamoto, Kawagoe, JP;
Ryoji Nagamine, Hidaka, JP;
Kazuo Hashimoto, Kawagoe, JP;
Masao Idei, Kawagoe, JP;
Yosuke Sato, Kawagoe, JP;
Kazuo Ibata, Kawagoe, JP;
Assignee:
Human Industry Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B29C / ; B29C / ;
U.S. Cl.
CPC ...
425 73 ; 425150 ; 425171 ; 4258 / ; 264101 ;
Abstract
A method of producing polyurethane foam slab by allowing a urethane foam stock solution in a tank to expand in a reduced pressure. The flatness of the top of the polyurethane foam is secured by providing a lifting jig or a plate within the tank, or by rotating the tank. An apparatus for carrying out the method is also provided.