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:
Sep. 04, 2012
Filed:
Apr. 16, 2009
Marc H. Labranche, Chapel Hill, NC (US);
Kenneth Warren Hang, Hillsborough, NC (US);
Alfred T. Walker, Oxford, PA (US);
Constance Wenger, Legal Representative, Oxford, PA (US);
Yuko Ogata, Tochigi, JP;
Marc H. Labranche, Chapel Hill, NC (US);
Kenneth Warren Hang, Hillsborough, NC (US);
Alfred T. Walker, Oxford, PA (US);
Constance Wenger, legal representative, Oxford, PA (US);
Yuko Ogata, Tochigi, JP;
E I du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
A substantially lead-free thick-film resistor paste composition is disclosed including a resistor composition dispersed in an organic vehicle. The resistor composition includes (a) RuOconductive material; (b) an α-oxide selected from CuO, NaO, KO, LiO and combinations thereof (c) a borosilicate glass composition having: (i) BO, (ii) SiO, (iii) a δ-oxide selected from BaO, CaO, ZnO, SrO, MgO and combinations thereof, and optionally including any of (iv) PO, (v) ZrOand (vi) AlO. The CuO α-oxide and TiO, TaO, NbOβ-oxide(s) and combinations thereof are present in the paste composition either separately, or in the borosilicate glass composition, or both. The NaO, KO, LiO α-oxide(s) and combinations thereof are present in the borosilicate glass composition. TCR values in the range of +/−100 ppm/° C. and R values of 100 ohms to 10 mega-ohms per square are obtained by resistors made from the paste composition.