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. 13, 1993
Filed:
Sep. 01, 1992
Applicant:
Inventor:
Rodney L Lakowske, La Crosse, WI (US);
Assignee:
American Standard Inc., New York, NY (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F01C / ;
U.S. Cl.
CPC ...
4182012 ; 418 87 ; 418 99 ; 418 84 ;
Abstract
An integral member is disposed internal of a refrigeration screw compressor which, upon compressor shutdown, shuts off the flow of oil injected into the compressor's working chamber as well as the oil directed to the compressor rotor bearings and which, at compressor startup, opens oil flow to those locations by the use of ambient internal compressor conditions that inherently exist at those respective times. The operation of the apparatus is therefore 'fail safe' and the need for external oil flow cutoff valving and the need to monitor and/or prove oil flow within the compressor is eliminated.