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:
Nov. 20, 2007
Filed:
May. 31, 2006
Oscar D'almeida, Boulogne Billancourt, FR;
Mathias Woydt, Berlin, DE;
Jean-thierry Audren, Saint Remy les Chevreuses, FR;
Oscar D'Almeida, Boulogne Billancourt, FR;
Mathias Woydt, Berlin, DE;
Jean-Thierry Audren, Saint Remy les Chevreuses, FR;
Sagem Defense Securite, Paris, DE;
Abstract
The invention concerns an actuator that includes an active piston, an inner sliding cylinder and an outer cylinder in which the said sliding cylinder is pre-stressed, where one of the cylinders is in a material with a negative thermal expansion coefficient or one that is close to zero, with the other cylinder having a positive thermal expansion coefficient, in which the material of the cylinder with negative expansion coefficient or one close to zero is one of the following materials: