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:
Feb. 22, 1994
Filed:
Oct. 02, 1992
Richard C Cornelison, Hiram, OH (US);
William B Retallick, West Chester, PA (US);
Raymond J Gorte, Philadelphia, PA (US);
W. R. Grace & Co.-Conn., New York, NY (US);
Abstract
A metal substrate contains a barrier which functions as an electrical insulator. One can thus use the substrate to make an electrically heated catalytic converter, in which one must electrically isolate a catalyst-bearing strip from adjacent strips. One forms the substrate by first coating the substrate with a thin first layer of alumina washcoat and heating the substrate to a temperature of about 800.degree. to 1000.degree. C. This heating step produces the barrier, which may constitute a spinel. One can then apply a catalyst to the substrate, either by applying one or more secondary layer(s) of washcoat, having greater thickness than the first layer, and impregnating the second layer with the catalyst, or by coating the substrate with a washcoat which already contains the catalyst. Alternatively, one can omit the step of applying the catalyst, and can use the strips to form a heater for a stream of gas. One can use the heater in conjunction with a main catalytic heater, or as a stand-alone heater.