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:
Jun. 21, 1977
Filed:
Nov. 03, 1975
Applicant:
Inventors:
James P Swanson, Winnebago, IL (US);
Stephen E Nyquist, Cherry Valley, IL (US);
Assignee:
W. A. Whitney Corporation, Rockford, IL (US);
Primary Examiner:
Int. Cl.
CPC ...
B26D / ; B26F / ;
U.S. Cl.
CPC ...
83137 ; 83390 ; 83461 ; 83639 ;
Abstract
A punch press in which pressure fluid which is introduced into a chamber is used to press a stripper against a workpiece and also to retract a piston which carries a punch. The pressure of the pressure fluid in the chamber is maintained at a substantially constant but selectively adjustable magnitude.