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:
Jul. 07, 1998
Filed:
Jan. 05, 1996
Applicant:
Inventor:
David N Shaw, New Britain, CT (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F25B / ; F01C / ;
U.S. Cl.
CPC ...
621963 ; 4182012 ;
Abstract
A helical-screw rotary compressor having a twin rotor configuration or a multi-rotor (i.e., at least three) configuration with defined compressor induction and discharge ends has at least one unloader piston disposed at said compressor discharge end with an economizer injection port therein. The unloader pistons being opened and closed in fine discrete steps by microprocessor controlled stepping motors which drive linear actuators.