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:
Dec. 25, 1979
Filed:
Sep. 07, 1977
Applicant:
Inventor:
Nakanobu Moritani, Tokyo, JP;
Assignee:
Kabushiki Kaisha Seikosha, , JP;
Primary Examiner:
Int. Cl.
CPC ...
B24B / ;
U.S. Cl.
CPC ...
5116 / ; 324 56 ;
Abstract
A controlling device which takes out an electrical signal including, as its component, a natural frequency that is produced with grinding of a piezo-electric element, and makes the signal pass through two filters possessing equivalent damping amount at a desired natural frequency so as to bring the grinding operation to a stop when the dc conversion outputs of both filters coincide with each other.