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:
Aug. 18, 1992
Filed:
Sep. 05, 1990
Applicant:
Inventors:
Gerhard Fischer, Dietzenbach, DE;
Andreas Herden, Darmstadt, DE;
Assignee:
E. I. du Pont de Nemours and Company, Wilmington, DE (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01B / ;
U.S. Cl.
CPC ...
356358 ; 356356 ; 226162 ;
Abstract
In a method and apparatus for linear transport of sheet and web material by piezotranslators, the longitudinal displacement is measured by an optical interferometer and the interferometer output is utilized to control the longitudinally acting piezotranslators.