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:
Apr. 30, 1991
Filed:
Mar. 06, 1989
Applicant:
Inventor:
Brian C Foster, Sutton, MA (US);
Assignee:
Ceramics Process Systems Corp., Milford, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428137 ; 428141 ; 428209 ; 428402 ; 428403 ; 428432 ; 428901 ; 252514 ; 252518 ; 106-114 ; 106-115 ; 106-118 ; 106-119 ; 106-121 ; 156 89 ;
Abstract
Dense metal vias in pure alumina substrates are derived from a metallization composition having 80-97% refractory metal, 2-15% alumina, 0.05-5% sintering aid, and 0-5% bonding additive; it has been found that for alumina contents greater than about 12%, a bonding additive is not required. The same compositions, absent the sintering aid, can be used to form bimetallic vias; these vias include a porous metal network where the pores are infiltrated with another metal, for example, porous tungsten infiltrated with copper.