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. 30, 2012
Filed:
Jul. 14, 2010
Robert Joseph Bouchard, Wilmington, DE (US);
Lap-tak Andrew Cheng, Newark, DE (US);
Kenneth Warren Hang, Hillsborough, NC (US);
David Herbert Roach, Hockessin, DE (US);
Robert Joseph Bouchard, Wilmington, DE (US);
Lap-Tak Andrew Cheng, Newark, DE (US);
Kenneth Warren Hang, Hillsborough, NC (US);
David Herbert Roach, Hockessin, DE (US);
E I du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
This invention provides a dielectric composition comprising a dielectric which is fireable in air at a temperature in the range of about 450° C. to about 550° C. and a conductive oxide selected from the group consisting of antimony-doped tin oxide, tin-doped indium oxide, a transition metal oxide which has mixed valence states or will form mixed valence states after firing in a nitrogen atmosphere at a temperature in the range of about 450° C. to about 550° C. and normally conducting precious metal oxides such as ruthenium dioxide, wherein the amount of conductive oxide present is from about 0.25 wt % to about 25 wt % of the total weight of dielectric and conductive oxide. This dielectric composition has reduced electrical resistance and is useful in electron field emission devices to eliminate charging of the dielectric in the vicinity of the electron emitter and the effect of static charge induced field emission.