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:
Feb. 28, 1989
Filed:
Jan. 06, 1988
Applicant:
Inventors:
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E04B / ; E04B / ; E04B / ;
U.S. Cl.
CPC ...
417-2 ; 417 18 ; 417 45 ; 417 53 ; 417265 ;
Abstract
Velocity control of two plungers provided in a pulsationless duplex plunger pump is effected by detecting pressure of a resultant discharge from the two plungers and positions of the plungers, and correcting sequentially a velocity instruction of the each plunger, based on pressure corresponding to the detected position of the each plunger so that the sum of velocities of the two plungers will be constant.