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:
Aug. 03, 1993
Filed:
Feb. 26, 1992
Applicant:
Inventors:
Helmut Honig, Gelting, DE;
Siegfried Geigel, Wolfratshausen, DE;
Assignee:
Peroxid-Chemie GmbH, Hoellriegelskreuth, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01B / ;
U.S. Cl.
CPC ...
423584 ;
Abstract
A method for further purifying previously distilled hydrogen peroxide for use in microelectronics in which a hydrogen peroxide starting solution purified initially by distillation is contacted, after the addition of a small amount of chelating agent, with a non-ion-exchanging polymeric adsorbent, such as a styrene-divinylbenzene copolymer, to obtain a highly purified hydrogen peroxide solution which satisfies the stringent purity requirements for use in producing 4-megabit and 16-megabit microprocessor chips.