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:
Jun. 26, 1979
Filed:
Jun. 02, 1978
Michael Mazzuchelli, Munich, DE;
Christian Stein, Munich, DE;
Manfred Wintzer, Unterpfaffenhofen, DE;
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Abstract
A substantially homogeneous ceramic mass comprised of about 48 to 88 wt. % of alumina; about 4 to 12 wt. % of polyvinyl butyral; about 0.5 to 5 wt. % of polypropylene oxide - ethylene oxide block polymer; about 3 to 10 wt. % of a polymer solution comprised of acrylic acid esters, methacrylic acid esters and mixed polymers thereof; about 3 to 10 wt. % of a polyvalent alcohol and mixtures of such alcohols; about 1 to 5 wt. % of triethylene glycol and about 0.5 to 10 wt. % of water is produced and vacuum-extruded into an endless relatively flat strip, dried to a green state, shaped into a desired substrate shape and, if to be used with thin layer circuits, subjected to a plane-parallel pressure of about 9,000 to 12,000 N/cm.sup.2 and then fired or sintered into rigid ceramic substrates.