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. 07, 1994
Filed:
Mar. 06, 1992
Applicant:
Inventors:
Tadahiro Ohmi, Sendai, JP;
Nobuhiro Miki, Osaka, JP;
Matagoro Maeno, Izumi, JP;
Ryozi Hirayama, Sakai, JP;
Assignee:
Hashimoto Chemical Co., Ltd., Osaka, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
210649 ; 210653 ; 210654 ; 95 16 ; 95 17 ;
Abstract
A method of preparing hydrofluoric acid of high purity at the point of use by causing molecular diffusion of hydrogen fluoride into ultrapure water through a resin membrane. The high-purity acid is available at the site of use free of contamination that would occur during transport from a site of preparation.