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:
Dec. 15, 1981
Filed:
Sep. 02, 1980
Applicant:
Inventors:
Andrew F Raab, Morton Grove, IL (US);
Raymond T Halstead, Wheeling, IL (US);
Assignee:
Indak Manufacturing Corp., Northbrook, IL (US);
Primary Examiner:
Int. Cl.
CPC ...
H01H / ; F16K / ;
U.S. Cl.
CPC ...
251318 ; 13762521 ; 137353 ;
Abstract
A vacuum control valve, comprising a wall having a vacuum supply port and a utilization port therein, a valve member movable along such wall, and means guiding the valve member for movement along a predetermined path along such wall, such valve member having a sealing member with sealing enclosure means for selectively producing communication between such ports, each of such ports comprising an opening with a tapered portion extending into such wall at the intersection between such opening and such wall to avoid the formation of any burr at such intersection.