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:
May. 11, 1993
Filed:
Nov. 19, 1990
Applicant:
Inventors:
Hiroyuki Aota, Kariya, JP;
Masatoshi Kuroyanagi, Kariya, JP;
Assignee:
Nippondenso Co., Ltd., Kariya, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K / ; F01L / ; F01L / ;
U.S. Cl.
CPC ...
251 57 ; 25112906 ; 123 9012 ; 123 9013 ;
Abstract
A piezoelectric apparatus includes a piezoelectric device which is biased by a fluid force instead of a spring. Since the fluid force can be maintained within a predetermined value even after the piezoelectric device has been used number of times, and since the fluid force can be modulated by fluid pressure providing means and valve means when the fluid force is decreased from the predetermined valve, the present piezoelectric apparatus can maintain the initial pressure on the piezoelectric device.