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:
May. 11, 2004
Filed:
Mar. 27, 2001
Ricardo Cozar, La Fermete, FR;
Pierre-Louis Reydet, Montigny Aux Amognes, FR;
Lucien Coutu, Suavugny les Bois, FR;
Imphy Ugine Precision, Puteaux, FR;
Abstract
Masking device for a flat-screen color-display cathode-ray tube, comprising a support frame for a tensioned shadow mask and a tensioned shadow mask. The support frame is made of a hardened Fe—Ni alloy having a thermal expansion coefficient between 20° C. and 150° C. of less than 5×10 K and a yield stress R at 20° C. of greater than 700 MPa; the tensioned shadow mask is made of an Fe—Ni alloy having a thermal expansion coefficient between 20° C. and 150° C. of less than 3×10 K ; the Fe—Ni alloys are chosen so that: below a temperature T , the mean expansion coefficient &agr; , between 20° C. and T, of the alloy of the support frame is greater than the mean expansion coefficient &agr; of the alloy of the shadow mask, and above T the coefficient &agr; of the alloy of the frame is less than the coefficient &agr; of the alloy of the shadow mask, where T <350° C. and preferably <300° C.