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. 09, 1989
Filed:
Sep. 08, 1987
Applicant:
Inventor:
William J Platt, Collingdale, PA (US);
Assignee:
National Rolling Mills, Inc., Malvern, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16B / ; E04C / ;
U.S. Cl.
CPC ...
52 98 ; 52232 ; 52667 ; 52484 ;
Abstract
A fire-resistant suspended ceiling grid structure having cross tees and main beams, to support ceiling tiles. The structure has shear means to permit a cross tee to expand into a main beam during a fire. The shear means have a notch behind a transverse tab formed in the cross tee which acts as a stop against the main beam in normal conditions, and shears or bends during a fire to permit the cross tee to expand into the main beam and still hold the tile in place.