Stackhouse Associates

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5046492 Clean room helmet systemExpiredJul 15, 88Sep 10, 91[A62B]
D304854 Portable air filterExpiredApr 27, 88Nov 28, 89[]
4826513 Laser smoke particulate/odor filter systemExpiredJan 25, 88May 02, 89[B01D]
4810269 Point one micron filtering systemExpiredApr 27, 88Mar 07, 89[B01D]

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