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. 12, 1990
Filed:
Apr. 12, 1989
Takeyoshi Yamada, Iwakuni, JP;
Kazumi Iwata, Iwakuni, JP;
Teijin Limited, Osaka, JP;
Abstract
A gas-permeable laminate for separating a specific gas from a gaseous mixture comprising a gas-permeable membrane having excellent selectivity for the specified gas and a porous support supporting said membrane, said gas-permeable membrane being a multilayer laminated membrane comprising at least a first and a second ultrathin membrane having excellent selectivity for the specified gas and a third ultrathin membrane of a different material from the materials of the first and second ultrathin membranes and located between the first and second ultrathin membranes, the material of the third ultrathin membrane having a higher permeation coefficient with respect to the specified gas than the materials of the first and second ultrathin membranes.