RALPH C. HAGEN (U.S.A.) CORP., 50 HAMPDEN ROAD, MANSFIELD, MASSACHUSETTS, A CORP. OF MASSACHUSETTS

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4980503 Conversion of glycol formates to monocarboxylic acidsExpiredAug 15, 86Dec 25, 90[C07C]
4774099 Process for making brownies containing cellulosic fiberExpiredMay 30, 86Sep 27, 88[A21D]
4757673 Adjustment of crop dividersExpiredJul 29, 86Jul 19, 88[A01D]
4746611 Process for recovering cellulasesExpiredDec 30, 85May 24, 88[C12R, C12N]
4669297 Press die lifter railExpiredMar 28, 86Jun 02, 87[B21J]
4512724 Electric pump for use in filtering system of a tropical fish tank or the likeExpiredMar 17, 83Apr 23, 85[F04B]
D274745 Filter cartridgeExpiredSep 10, 81Jul 17, 84[]
D273223 FilterExpiredOct 05, 81Mar 27, 84[]
4385989 Filter assembly and cartridge thereforExpiredSep 16, 81May 31, 83[C02F]
4285813 Aquarium filtration apparatusExpiredJun 28, 79Aug 25, 81[E04H]
4206719 Aquarium hood apparatusExpiredApr 17, 78Jun 10, 80[A01K]

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