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:
Feb. 11, 1986
Filed:
Jan. 14, 1985
Applicant:
Inventor:
John D Petro, Hubbard, OH (US);
Assignee:
Commercial Shearing, Inc., Youngstown, OH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F15B / ;
U.S. Cl.
CPC ...
13759613 ; 13759612 ;
Abstract
An inlet unloader valve is provided for insertion ahead of one or more open center valve work sections having a pressure beyond port, which unloader valve has a spring biased spool, normally closing communication from the inlet to exhaust and proportionally opened by signal pressure from the pressure beyond port and the inlet and exhaust chambers to control flow through the work sections.