ENVIRONMENTAL TECHNOLOGIES CORP.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5379605 Method for cleaning air conditioning systemExpiredJan 27, 94Jan 10, 95[F25B]
5353603 Dual refrigerant recovery apparatus with single vacuum pump and control meansExpiredFeb 23, 94Oct 11, 94[F25B]
5337578 Trapped air monitor for a refrigerant recovery unitExpiredFeb 19, 93Aug 16, 94[F25B]
5249434 System and method for automatic charging of refrigeration systemsExpiredJul 06, 92Oct 05, 93[F25B]
5181388 Refrigerant recovery unit with pure systemExpiredNov 05, 91Jan 26, 93[F25B]
5115645 Heat exchanger for refrigerant recovery systemExpiredNov 29, 90May 26, 92[F25B]

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