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:
May. 11, 1993
Filed:
Oct. 01, 1990
Norihiro Kaiya, Tsukuba, JP;
Naoyuki Amaya, Tsukuba, JP;
Yoshishige Murata, Tsukuba, JP;
Mikio Takagi, Okazaki, JP;
Kazuichi Tsuda, Nagoya, JP;
Kiyotaka Shigehara, Tokyo, JP;
Akira Yamada, Kamifukuoka, JP;
Takayuki Otsu, Nara, JP;
Nippon Oil and Fats Co., Ltd., Tokyo, JP;
Other;
Abstract
An ultrathin polymeric membrane has a membrane thickness of 10 to 1,000 .ANG.. The membrane is constituted of polycarboxylate and obtained by the spin coating method or by the Langmuir-Blodgett method. The polycarboxylate contains recurrent units represented by the formula (I) ##STR1## wherein R.sub.1 and R.sub.2 represent different groups and each stands for a methyl group or a hydrogen atom, and R represents a hydrocarbon group selected from the group consisting of a branched alkyl group having 3 to 12 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, a substituted alkyl group having 2 to 6 carbon atoms, a substituted cycloalkyl group having 3 to 10 carbon atoms and a siloxanic hydrocarbon group.