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:
Aug. 02, 1983
Filed:
May. 07, 1981
Applicant:
Inventor:
William R Hutchinson, Winston-Salem, NC (US);
Assignee:
Ingersoll-Rand Company, Woodcliff Lake, NJ (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F01B / ;
U.S. Cl.
CPC ...
415 28 ; 415 29 ;
Abstract
The invention comprises incorporating in the wall of a typical unloader valve for a compressor, a normally-closed, pressure-responsive valve for admitting product compressed air therethrough, into the valve chamber, for re-circulation of the admitted air through the compressor. In the first embodiment illustrated, a pilot air pressure, which modulates the unloader valve throttling piston, is also addressed to a passageway which opens onto the normally-closed valve. When the pilot air pressure is substantially elevated, the normally-closed valve opens.