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:
Jun. 06, 1978
Filed:
Jun. 01, 1976
Paul O Hain, Hamilton, OH (US);
Champion International Corporation, Stamford, CT (US);
Abstract
Automotive exhaust gases, and especially the exhaust gases which have been further oxidized by a treatment in a catalytic converter, are treated by passing them through a filter containing paper coated with a calcium carbonate coating. The paper is desirably coated on both sides with heavy coatings and wound into a roll with spacers extending through the roll to permit the gases to pass therethrough. The calcium carbonate desirably constitutes at least 85% of the weight of pigments and fillers in the coating and the proportion of binder does not exceed 20% of the total weight of pigments and fillers. The acidic gases in the exhaust, and particularly the oxides of sulfur, react with the finely divided particles of calcium carbonate in the coating to form an ash which flakes off from the lower face of the roll while the gases pass upwardly through the roll.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile