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:
Nov. 07, 1989
Filed:
Mar. 24, 1988
Hideaki Kurokawa, Hitachi, JP;
Akira Yamada, Hitachi, JP;
Yasuo Koseki, Hitachiota, JP;
Harumi Matsuzaki, Hitachi, JP;
Katsuya Ebara, Mito, JP;
Sankichi Takahashi, Hitachi, JP;
Hiroaki Yoda, Ibaraki, JP;
Nobuatsu Hayashi, Abiko, JP;
Isao Okouchi, Hitachi, JP;
Yukio Hishinuma, Hitachi, JP;
Naohiro Momma, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention relates to a process for producing ultra-pure water, an apparatus for producing said ultra-pure water and a process for using the ultra-pure water produced according to said process. More particularly, the present invention relates to a process for producing ultra-pure water which comprises boiling a raw water to vaporize off the volatile components from the raw water, subsequently generating steam from the water, contacting the steam with a hydrophobic, porous, gas-permeable and liquid-impermeable membrane to make the steam permeate the membrane, and then condensing the steam, as well as to an apparatus for producing said ultra-pure water and a process for using said ultra-pure water.