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:
Nov. 28, 1995
Filed:
Dec. 27, 1994
Daniel L Tuma, Minneapolis, MN (US);
Jacques V Van Peteghem, Brugge, BE;
Olivier H Ronneau, Chapelle-Lez-Herlaimont, BE;
Donaldson Company, Inc., Minneapolis, MN (US);
Abstract
A filtering apparatus (12) includes a filter cartridge (28) which may be replaced or cleaned and re-used. The filter apparatus also includes a heat exchanger (62) which receives cooling air to cool the exhaust prior to filtering. The cooled exhaust does not pose combustion problems for soot or the filter material in the cartridge (28). In addition to cooling the exhaust, a temperature-sensitive valve (36) opens and closes to prevent excessively hot exhaust gas from reaching the filter cartridge (28). The valve (36) includes bi-metal discs (52) which bow outward when the temperature increases and flatten when the temperature decreases. The discs engage a cover to an orifice and slide axially to open and close the valve (36). The apparatus also may include a back pressure valve (72) which will open when the exhaust flow is backed up to prevent damage to the engine.