Exhaust system pressure control
United States Patent D360178

Thomas, William E. (413 Robinson Cir., Placentia, CA, 92670)
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Field of Search:
D12/114, D12/194, D8/71, D9/302, 181/227, 181/228, 181/238, 181/247, 181/257, 181/266, 60/312, 60/314, 60/315, 60/317, 60/272, 60/274, 60/323
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US Patent References:
5282361Device for facilitating exhaust action of an internal combustion engineFebruary, 1994Sung60/315
5248859Collector/muffler/catalytic converter exhaust systems for evacuating internal combustion engine cylindersSeptember, 1993Borla181/257
5173576Muffler for an internal combustion engineDecember, 1992Feuling181/247
5044464Active acoustic attenuation mixing chamberSeptember, 1991Bremigar60/312
5033581Muffler for an internal combustion engineJuly, 1991Feuling181/257
4912927Engine exhaust control system and methodApril, 1990Billington60/315
4834214Muffler for an internal combustion engineMay, 1989Feuling181/249
4796426High efficiency transition element positioned intermediate multi-cylinder exhaust system and secondary pipe assembliesJanuary, 1989Feuling60/313
4712643Particulate trap exhaust mufflerDecember, 1987Iles et al.181/257
4390079Muffler and exhaust extractorJune, 1983Brill181/228
4206600Exhaust system for four-stroke internal combustion enginesJune, 1980Feuling60/312
3983696Combustion engine having at least one outlet passageOctober, 1976Pflugfelder60/272
3946558Exhaust system and methodMarch, 1976Beekhuis, Jr.60/274
3716992ADAPTOR FOR EXHAUST MANIFOLDFebruary, 1973Stahl60/323
D212447N/AOctober, 1968KaserD8/71
2168528Exhaust passage of two-stroke internal combustion enginesAugust, 1939Kadenacy60/314
2147200Internal combustion engineFebruary, 1939Kadenacy60/314

Primary Examiner:
Word, Hugo A.
Assistant Examiner:
Brown M.
Attorney, Agent or Firm:
Knobbe, Martens, Olson & Bear
1. The ornamental design for the exhaust system pressure control, as shown anddescribed.


FIG. 1 is a perspective view of an exhaust system pressure control showing my new design;

FIG. 2 is a front view of the exhaust system pressure control of FIG. 1;

FIG. 3 is a cross-sectional view taken along 3--3 of FIG. 2;

FIG. 4 is a back view of the exhaust system pressure control of FIG. 1; and,

FIG. 5 is a side view of the exhaust system pressure control of FIG. 1.