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. 15, 1979
Filed:
May. 05, 1978
Applicant:
Inventors:
Glenn F Hyde, Timonium, MD (US);
Harvey A Kasinoff, Reisterstown, MD (US);
Gordon L Morgret, Baltimore, MD (US);
Richard R Pfunder, Cockeysville, MD (US);
Charles E Thomas, Reisterstown, MD (US);
Assignee:
Koppers Company, Inc., Pittsburgh, PA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
A01J / ;
U.S. Cl.
CPC ...
425369 ; 148-4 ; 156461 ; 425336 ;
Abstract
An improved corrugator roll for use in an apparatus for making corrugated paperboard wherein the flute tip and a portion flank of the roll base metal are selectively hardened to a predetermined depth by an electro magnetic process. The valleys of the flutes and the remainder of the flank are maintained at the same hardness as the base material.