Heat Exchanger Industries, Inc.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4852344 Waste disposal method and apparatusExpiredJun 06, 88Aug 01, 89[F02C, F02G]
4776391 Heat exchanger method and apparatusExpiredApr 03, 87Oct 11, 88[F28B, F28F]
4705101 Flue gas reheat apparatusExpiredMar 21, 86Nov 10, 87[F28D, F28F]
4577380 Method of manufacturing heat exchangersExpiredNov 14, 84Mar 25, 86[B23P, B29C, F28F, B21D]
4557202 Exhaust gas treatment method and apparatusExpiredAug 10, 82Dec 10, 85[F23J, DIG.]
4526112 Heat exchanger method and apparatusExpiredNov 14, 84Jul 02, 85[F23J]
4487139 Exhaust gas treatment method and apparatusExpiredAug 10, 82Dec 11, 84[F23J]

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