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. 07, 1993
Filed:
May. 03, 1991
Alan L Kovacs, Long Beach, CA (US);
Gary W Johnson, Irvine, CA (US);
William A Vitriol, Anaheim, CA (US);
Clifford L Shock, Jr, San Luis Obispo, CA (US);
Hughes Aircraft Company, Los Angeles, CA (US);
Abstract
A lid (2) for an electronic circuit housing (4) has inner (24) and outer (22) laminated layers that are formed from two different materials, joined to each other and bowed outward from the housing (4) so that the inner layer (24) is under tensile bending stress at the interface between the layers, and the outer layer (22) is under compressive bending stress at the interface. This forms a pre-stress on the lid that resists external loads, and causes the lid to deflect under loading in a linear, predictable and recoverable fashion. The lid is preferably formed by thermal bonding of two materials having different coefficients of thermal expansion, with the bow forming as the materials cool. In one example two different metals are used, and in another a metal is bonded to a glass-ceramic tape.