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. 30, 1980
Filed:
Nov. 02, 1977
Prabhakar B Ghate, Dallas, TX (US);
Arthur M Wilson, Richardson, TX (US);
Clyde R Fuller, Plano, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A microelectronic integrated circuit having first and second levels of thin-film metallization separated by an insulation layer is provided with a system for electrical interconnections between metallization levels, at selected locations, without requiring extra spacing between metal paths, in either the first or second levels. Maximum circuit density is thereby permitted, with no restriction on the placement of interconnection vias. Circuit layout is greatly simplified because all metal paths have uniform widths and minimum spacings, achieved with the use of vias that are 'oversized' in both the transverse and longitudinal directions. Consequently, it is required that second level metal differ in composition from first level metal, and be patterned with an etchant that does not attack first level metal.