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:
Mar. 13, 1984
Filed:
Feb. 04, 1982
Applicant:
Inventors:
Masashi Ishiyama, Minami-ashigara, JP;
Michinori Ishibashi, Higashimurayama, JP;
Assignees:
Fuji Photo Film Co., Ltd., , US;
Nikkiso Co., Ltd., , US;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F04B / ;
U.S. Cl.
CPC ...
417385 ; 91402 ;
Abstract
In a diaphragm type pump, a minute amount of the operating fluid is supplied instantaneously from an oil reservoir to an operating chamber at the final stage of the suction stroke in a main cylinder, and an excessive amount of the operating fluid and/or bubbles are discharged into the oil reservoir in the delivery stroke in the main cylinder. The minute amount of the operating fluid is within the range of 0.1 to 2% of the whole volume of displacement of diaphragm.