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:
Feb. 20, 1990
Filed:
Apr. 12, 1988
Lance R Kaufman, Mequon, WI (US);
Other;
Abstract
An electric circuit assembly (12) includes a ceramic tub (14) having a floor (16) and an integral side wall (18) around the perimeter thereof and extending upwardly therefrom. Copper lead frames (20, 22, 24), are directly and hermetically bonded to the bottom of the tub floor at apertures (40, 42, 44) therethrough. A semiconductor chip (38) is connected to the lead frames through the apertures in the floor of the tub. A top cover (36) is hermetically sealed to the top (32) of the side wall of the tub to close the tub and hermetically seal the semiconductor chip therein. A first copper ring (30) is directly bonded to the top of the side wall of the tub and a second copper ring (34) is directly bonded to the underside of the ceramic top cover, and the rings are subsequently welded to each other.