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:
Dec. 21, 1982
Filed:
May. 29, 1981
Applicant:
Inventors:
Mitsuru Tokuyama, Utsunomiya, JP;
Kenji Ohki, Chiba, JP;
Masayuki Sagae, Tochigi, JP;
Kaoru Tsujii, Utsunomiya, JP;
Assignee:
Kao Soap Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B / ; B32B / ;
U.S. Cl.
CPC ...
428149 ; 5128 / ; 264239 ; 264340 ; 428143 ; 428323 ; 428325 ; 428327 ; 428330 ; 428331 ; 428332 ;
Abstract
A porous sheet is disclosed that comprises a thin, flexible sheet made of thermoplastic resin having solid particles distributed therein. Small spaces are formed around the particles, such that abrasion or buffing of the opposite surfaces of the sheet causes the formation of a multitude of fine pores that extend through the sheet, making the sheet vapor-permeable but liquid-impermeable.