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:
Sep. 13, 1977
Filed:
Dec. 22, 1975
Paul H Reeve, River Vale, NJ (US);
Auto Research Corporation, Rochelle Park, NJ (US);
Abstract
The output from the pump chamber of a higher volume piston pump is divided between a return bypass and the pump chamber of a smaller volume piston pump; the piston of the high volume piston pump is periodically raised by a cam to draw fluid into the pump chamber; when this piston is released, a spring forces fluid from the high volume pump chamber; the pump chamber of the small volume pump is connected with the cam such that the volume of the low volume pump chamber decreases, thereby pumping out the fluid in that chamber, when the large volume pump chamber is taking in fluid, and vice versa; appropriate valves ensure that flow is only in the desired direction; adjustment and calibration means are provided for the low volume pump.