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:
Dec. 29, 1987
Filed:
Nov. 25, 1985
Yuh-Geng Tsay, San Jose, CA (US);
Myron A Beigler, Los Altos Hills, CA (US);
Emanuel Calenoff, Burlingame, CA (US);
Gerald L Friesen, Vacaville, CA (US);
James L Nichols, Los Altos, CA (US);
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Abstract
A storage-stable, high potency allergenic extract is prepared by ultrafiltration, retaining fractions having molecular weights of from 1000 to 100,000, and treating the solution with gel polymer and/or carbon absorbents. The extract is dried to a moisture content of less than one weight percent water. The purified solution and aqueous reconstituted solutions of the dried extract provide a transparent, colorless solution which has greatly increased stability, remaining transparent and colorless for extended periods.