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:
Apr. 08, 1980
Filed:
Jul. 27, 1978
Applicant:
Inventors:
James L Oravitz, Jr, Cheswick, PA (US);
John R Dahlberg, Jeannette, PA (US);
Assignee:
PPG Industries, Inc., Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B26F / ; C03B / ;
U.S. Cl.
CPC ...
225-2 ; 225 935 ; 225 965 ;
Abstract
A glass ribbon moves downstream under a pair of scoring wheels to score the bulb edges of the ribbon and thereafter past a cross scorer to laterally score the ribbon. As the ribbon moves further downstream the scores at the bulb edge move under (1) a plurality of hot airstreams which propagate the fissure depth of the score and (2) under a cold airstream to concentrate the stress field about the score line to prevent premature severing of the bulb edges due to mechanical vibrations generated during subsequent opening of the lateral score.