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. 09, 2001
Filed:
Apr. 15, 1999
George C. Boyse, Rocklin, CA (US);
Richard S. Colombero, Sacramento, CA (US);
David J. Wierzbicki, Homewood, IL (US);
Greif Bros. Corporation, Delaware, OH (US);
Abstract
A multi-panel hollow door has a core made of corrugated paperboard. The core is formed from a stack of plies in which adjacent plies are adhered to one another in accordance with a predetermined pattern of adherence (e.g., a gluing pattern). The stack is expanded in a direction perpendicular to the plies to form an elongated series of cells disposed longitudinally between transversely spaced panel indentations of a door skin, at a central region of the door. Each cell has a pair of transversely spaced vertices, and juxtaposed end portions of vertex-forming plies form tabs. Each tab is preferably oriented to overlap an adjacent portion of a vertex-forming ply, the desired orientation being obtained by partial slitting of a single vertex-forming ply. Unexpanded end portions of a stack of plies may be broken off to form pads between corresponding portions of the skins.