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:
Oct. 19, 1976
Filed:
May. 29, 1975
Ian Burn, Williamstown, MA (US);
Sprague Electric Company, North Adams, MA (US);
Abstract
A monolithic ceramic capacitor having base metal electrodes is described that meets the standard TCC limits of .+-. 15% from -55.degree. C to 125.degree. C. The ceramic includes small quantities of acceptor dopants, particularly manganese added to barium titanate and an alkali-earth-metal-zirconate. When fired from 1250.degree. C to 1400.degree. C in a partial oxygen atmosphere of 10.sup..sup.-7 to 10.sup..sup.-9 atmospheres of oxygen, a liquid phase sintering occurs during which the titanate-zirconate grains do not grow and there is formed a concentration gradient of the zirconate near the grain surfaces while a liquid manganese titanate forms a second and immiscible phase in the grain boundary regions.