US Patent:
20080163615, Jul 10, 2008
Inventors:
Scott R. Trimingham - Torrance CA, US
International Classification:
F01N 3/021
Abstract:
An exhaust filtration system including a gap upstream of the filter and a regular pressure device downstream of the filter to thus normally maintain a pressure differential across the filter but operative to, upon build up of pressure upstream of the filter provide for relief to the atmosphere.