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:
Apr. 01, 2003
Filed:
May. 29, 2001
Douglas M. Beall, Painted Post, NY (US);
David L. Hickman, Big Flats, NY (US);
Gregory A. Merkel, Painted Post, NY (US);
Corning Incorporated, Corning, NY (US);
Abstract
A ceramic comprising predominately a cordierite-type phase approximating the stoichiometry Mg Al Si O and having a coefficient of thermal expansion (25-800° C.) of greater than 4×10 /° C. and less than 13×10 /° C. and a permeability and a pore size distribution which satisfy the relation 2.108 (permeability)+18.511 (total pore volume)+0.1863 (percentage of total pore volume comprised of pores between 4 and 40 micrometers)>24.6. The ceramic is suitable in the fabrication of cellular, wall-flow, diesel particulate filters having a pressure drop in kPa that at an artificial carbon soot loading of 5 grams/liter and a flow rate of 26 scfm is less than 8.9−0.035 (number of cells per square inch)+300 (cell wall thickness in inches), a bulk filter density of at least 0.60 g/cm and a volumetric heat capacity of at least 0.67 J cm K as measured at 500° C.