PRO-TECH RESPIRATORS, INC., A MI CORP.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5042473 Demand valve for a respiratorExpiredFeb 15, 90Aug 27, 91[A62B]
4578843 Strap connector and method of making the sameExpiredJun 11, 84Apr 01, 86[A44B]

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