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:
Jan. 11, 1994
Filed:
Apr. 24, 1992
Applicant:
Inventors:
John Felegi, Jr, lancaster, PA (US);
Kenneth P Kehrer, lancaster, PA (US);
Edward E Wise, Jr, lancaster, PA (US);
Assignee:
Armstrong World Industries, Inc., Lancaster, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21H / ;
U.S. Cl.
CPC ...
162145 ; 162169 ; 1621818 ; 162208 ; 162212 ; 162216 ;
Abstract
A novel composite board of mineral wool, perlite, and cellulosic newsprint fibers for use as an acoustical tile is disclosed. The board displays a high porosity, a fine pore structure, a low density gradient through its thickness and an acceptable strength. The board is manufactured by a process that includes a flotation step prior to the final formation step.