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:
Mar. 13, 1990
Filed:
Dec. 24, 1986
Applicant:
Inventor:
John G Mitchell, Trumansburg, NY (US);
Assignee:
NCR Corporation, Dayton, OH (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B41J / ; B41J / ; G01B / ;
U.S. Cl.
CPC ...
4001572 ; 324226 ; 32420716 ; 32420724 ; 400 55 ; 400704 ;
Abstract
A method and apparatus including a circuit for measuring the displacement of an electromagnetic device wherein the measuring is effected by utilizing the perturbations which occur in the energizing current of the device when the moveable member contacts a second member during a 'gap' measurement, for example. The circuit includes circuitry for obtaining a first derivative signal having indicator portions corresponding to the perturbations. An apparatus including a test block is used for testing center-to-center distances.