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:
Aug. 13, 1991
Filed:
Dec. 05, 1988
Clifford G Thiel, Stillman Valley, IL (US);
Sundstrand Corporation, Rockford, IL (US);
Abstract
Hydrostatic clamping devices (20, 40) are provided to exert uniform pressure across the faces of components such as wafers (22) to constitute an integrated electronics package or power bar. The devices (20, 40) use the principle of hydrostatic pressure in a bladder (28, 41, 42) to provide uniform pressure to the faces of the components (22) through contacts (23). To permit the application of different but uniform forces to different components in a package, spreaders (34, 35) having end surfaces with unequal areas can be inserted between the bladders (28, 41, 42) and components (22) to cause the application of a different magnitude of force to the wafers (22) in a power bar.