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:
Feb. 14, 1989
Filed:
Apr. 08, 1987
Applicant:
Inventors:
Roger M Rowell, Madison, WI (US);
Rune Simonson, Gothenburg, SE;
Anne-Marie Tillman, Gothenburg, SE;
Assignee:
Primary Examiner:
Int. Cl.
CPC ...
D06M / ; D06M / ; B05D / ; B05D / ;
U.S. Cl.
CPC ...
8121 ; 427212 ; 427440 ;
Abstract
Reaction of lignocellulosic material with uncatalyzed acetic anhydride in the absence of any cosolvent is disclosed. The process improves dimensional stability and resistance to biological attack of the lignocellulosic material. Lignocellulosic material is treated by exposure to liquid acetic anhydride for at least a short period of time, after which it is then heated to acetylate the material. The excess anhydride and byproduct acetic acid can be removed by vacuum.