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. 24, 1989
Filed:
Jul. 25, 1988
Applicant:
Inventor:
Toshiharu Mamiya, Kawasaki, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01D / ; B41J / ; F04B / ;
U.S. Cl.
CPC ...
3461 / ; 417444 ;
Abstract
In a pump device wherein a piston is reciprocally moved in a predetermined range within a cylinder to thereby produce pressure, a liquid inflow hole is provided outside the predetermined range of the cylinder and a hermetically sealing member biased so as to hermetically seal the liquid inflow hole until the piston is moved by a predetermined amount is provided.