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. 29, 1987
Filed:
Oct. 28, 1986
John E Ahearn, Middleboro, MA (US);
Raymond A Frates, Fairhaven, MA (US);
Dennis Girard, New Bedford, MA (US);
Richard A Koepke, New Bedford, MA (US);
James K Schmidt, Mt. Pleasant, PA (US);
C Dodd Manon, Ligonier, PA (US);
Isotronics, Inc., New Bedford, MA (US);
Abstract
A duplex glass preform for forming hermetic glass-to-metal seals. The duplex glass preform comprises a glass infrastructure or matrix having at least one end thereof modified by the selective distribution therein of ceramic particles. The ceramic particles are selectively distributed to form a ceramic density gradient having the largest concentration of ceramic particles at the surface and gradually decreasing with depth. The duplex glass preform of the present invention has utility in forming glass-to-metal seals in hybrid metal packages containing microcircuit chips.