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. 20, 2007
Filed:
Jul. 29, 2004
Thomas Muhr, Attendorn, DE;
Bernfried Hesselmann, Wenden, DE;
Andreas Rinsdorf, Freudenberg, DE;
Volker Schütz, Daaden, DE;
Harold Brenner, Sassenroth, DE;
Thomas Muhr, Attendorn, DE;
Bernfried Hesselmann, Wenden, DE;
Andreas Rinsdorf, Freudenberg, DE;
Volker Schütz, Daaden, DE;
Harold Brenner, Sassenroth, DE;
Muhr und Bender KG, , DE;
Abstract
A plate spring of a substantially circular-ring-shaped form having a substantially externally conical upper side () and a substantially internally conical underside () between which there are positioned an outer annular edge () and an inner annular edge (), wherein, in the unloaded condition, the surface layer () of the underside () comprises a higher inherent compressive stress than the surface layer () of the upper side ().