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:
May. 03, 1988
Filed:
May. 23, 1986
Applicant:
Inventors:
H Nelson Beck, Walnut Creek, CA (US);
Dalton C MacWilliams, Alamo, CA (US);
Assignee:
The Dow Chemical Company, Midland, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
4285371 ; 428541 ; 428921 ; 427297 ; 427393 ; 4273933 ; 427440 ; 106 1816 ; 106 1817 ;
Abstract
Methods for impregnating the pores of at least partially dried wood with a phosphorus nitride, particularly P.sub.3 N.sub.5, to provide flame resistance are described. Preferably liquid slurries of the phosphorus nitride are impregnated into the exposed pores of the wood using pressure or preferably a partial vacuum in a confined space which removes air from the pores and allows the slurry to impregnate the wood. The liquid is then removed from the wood.