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:
Aug. 30, 2016
Filed:
Dec. 30, 2013
E I Du Pont DE Nemours and Company, Wilmington, DE (US);
Marc H Labranche, Chapel Hill, NC (US);
Kenneth Warren Hang, Cary, NC (US);
EI DU PONT DE NEMOURS AND COMPANY, Wilmington, DE (US);
Abstract
Thick film resistor paste compositions, and methods for making the thick film compositions are disclosed. The compositions include a resistor composition dispersed in an organic vehicle. The resistor composition has 3 to 60% by weight RuOconductive material, 5 to 75% by weight Ag conductive material, 15 to 60% by weight glass frit and optionally up to 10% by weight copper oxide or precursor thereof, and up to 20% by weight bismuth oxide or precursor thereof. Optionally the glass is (by weight) 25-45% SiO, 2-15% AlO, 0-3% ZrO, 0-8% BO, 5-15% CuO, 0-8% BaO, 0-3% PO, and 20-50% BiO. The resistor composition when printed to a dry thickness and fired at a temperature between 750° C. and 950° C. achieves a sheet resistivity between 10 and 10,000 milliohms/square and a hot temperature coefficient of resistivity of 1000 ppm/C or higher. The fired resistor composition may achieve a resistance thickness ratio (R) value between 0.75 and 1.50.