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. 15, 1991
Filed:
Nov. 29, 1989
Applicant:
Inventors:
Assignee:
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ; B05B / ;
U.S. Cl.
CPC ...
310317 ; 310316 ; 123478 ; 123498 ;
Abstract
In an apparatus for driving a piezoelectric element used for closing and opening a valve member, a first-step voltage is applied to the piezoelectric element to move the valve element near to a valve seat, and thereafter, a second-step voltage higher than the first-step voltage is applied to the piezoelectric element to seat the valve element securely on the valve seat.