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:
Oct. 16, 1990
Filed:
Jun. 05, 1989
Applicant:
Inventors:
David J Lapham, Derbyshire, GB;
Nicholas A Troughton, Cheshire, GB;
Assignee:
Micro-Image Technology Limited, London, GB;
Primary Examiner:
Int. Cl.
CPC ...
C01B / ; C23G / ; C09K / ; C11D / ;
U.S. Cl.
CPC ...
423513 ; 134-3 ; 134 41 ; 1566591 ; 156901 ; 156904 ; 252 792 ; 252 794 ; 25218627 ; 423273 ;
Abstract
Aqueous mixed permonosulphuric acid/sulphuric acid solutions, such as semiconductor surface photoresist stripping solutions may be stabilised for storage by the addition of one or more of the metals gallium, germanium, indium, tin in the 4-valent form, antimony, thallium, bismuth and lead suitably in the oxide or hydrous oxide form. Mixtures of metals, for example of bismuth, tin in the 4-valent form, gallium and germanium may be particularly effective.
Lapham, David. (1990). Solutions of permonosulphuric acid (U.S. Patent No. 4963342). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4963342
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile