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:
Oct. 20, 1981
Filed:
Jan. 22, 1979
Applicant:
Inventor:
Robert L Cain, Bryan, OH (US);
Assignee:
Robinair Manufacturing Corporation, Montpelier, OH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F04B / ;
U.S. Cl.
CPC ...
417 62 ; 417244 ; 417360 ; 418 39 ; 418 97 ; 418147 ;
Abstract
The invention pertains to vacuum pump structure, and the innovations include a multiple pumping chamber pump wherein substantially identical pumping chambers may be assembled in contiguous relationship, and by the selective use of a pump head plate mounted upon both chambers the pump may operate in either a series or parallel mode. Further innovations include a novel air conducting nozzle which minimizes oil loss, and the pump employs a combination carrying handle and base interposed between the motor and pumping structure which facilitates assembly and handling.