Respirator Research, Ltd.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4971050 Open circuit emergency breathing apparatus and pressure demand valve thereforExpiredNov 03, 87Nov 20, 90[A61M]
4917081 Portable emergency breathing apparatusExpiredSep 24, 87Apr 17, 90[A62B]
4800923 Portable emergency breathing apparatusExpiredDec 04, 87Jan 31, 89[F16K]
4798203 Portable emergency breathing apparatusExpiredNov 20, 86Jan 17, 89[A62B]
4794923 Portable emergency breathing apparatusExpiredOct 23, 86Jan 03, 89[A62B]
D297869 Emergency breathing gas container and control mechanismExpiredNov 25, 86Sep 27, 88[]
4750485 Portable emergency breathing apparatusExpiredDec 05, 86Jun 14, 88[A62B]
4744357 Portable emergency breathing apparatusExpiredOct 30, 86May 17, 88[A62B]
4724833 Portable emergency breathing apparatusExpiredMay 02, 86Feb 16, 88[A62B]
4722333 Portable emergency breathing apparatusExpiredAug 05, 85Feb 02, 88[A62B]

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