O-TWO SYSTEMS INTERNATIONAL INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6209579 Low supply pressure alarm for gas supplyExpiredFeb 08, 99Apr 03, 01[F16K]
6067022 Low input pressure alarm for gas inputExpiredApr 27, 98May 23, 00[G08B]
5537999 Breathing apparatusExpiredDec 10, 93Jul 23, 96[A61M]
4622964 Valve for breathing deviceExpiredMar 05, 85Nov 18, 86[A62B]
D275616 Pressure regulator control module for self-contained breathing apparatusExpiredMar 23, 82Sep 18, 84[]
4449524 Self-contained breathing apparatus with provision for shared useExpiredMar 15, 82May 22, 84[A62B]

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