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:
Jul. 07, 1992
Filed:
Dec. 13, 1989
Applicant:
Inventors:
Ronald P Marx, Grand Chute, WI (US);
James O Cheshire, Neenah, WI (US);
Assignee:
James River Corporation of Virginia, Richmond, VA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F27D / ; H05B / ; H01C / ;
U.S. Cl.
CPC ...
219385 ; 219387 ; 219541 ; 219542 ; 219552 ; 338195 ;
Abstract
An improved heaterboard, and method and apparatus for producing same is disclosed herein. A foil layer is bonded to a paperboard substrate and a circuit path is cut in the foil layer to define a heating circuit. In a preferred method, the circuit is defined by cut scores and short-circuiting across the cut scores is prevented by a reverse scoring operation in which the circuit pattern is scored in the surface of the heaterboard opposite the surface having the foil heating layer thereon. Various heaterboard circuit patterns and an apparatus for forming heaterboards are also disclosed.