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. 05, 1989
Filed:
Jul. 22, 1988
Horst Hoffmann, Pentling, DE;
Peter Kersten, Leonberg, DE;
Hans Volz, Schwieberdingen, DE;
Ulrich Seyfried, Stuttgart, DE;
Alcatel N.V., Amsterdam, NL;
Abstract
A strain gauge comprised of a premagnetized ferromagnetic film wherein any change in length of the film can be measured by employing the properties of magnetostriction and magnetoresistance. The strain gauge is deposited on a substrate by thin-film techniques and has a very high sensitivity. Preferably, two electrically insulated strips parallel strips of amorphous metal film have (in the absence of strain) respective directions of magnetization aligned antiparallel to one another and are connected electrically at one end. Such an arrangement facilitates the reversion of the magnetization back to its easy direction when the stress causing the strain is removed.