MCQUAY-PERFEX INC., A CORP. OF MN.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4475588 Heat exchanger with tubes fixed at bafflesExpiredSep 28, 81Oct 09, 84[F28F]
4469132 Damper apparatusExpiredJun 28, 82Sep 04, 84[F16K, F24F]
4434846 Patterned heat exchanger finExpiredApr 06, 81Mar 06, 84[F28D, F28F]
4429782 Screw conveyer with removable flightingExpiredOct 16, 81Feb 07, 84[B65G]
4426120 Sectioned cabinet for room air conditioning unitExpiredApr 20, 81Jan 17, 84[A47B]
4412429 Ice cube makingExpiredNov 27, 81Nov 01, 83[F25C]
4392417 Variable dead band pressure control systemExpiredAug 18, 80Jul 12, 83[B64D]
4363596 Method and apparatus for surge detection and control in centrifugal gas compressorsExpiredMay 19, 80Dec 14, 82[F01D]
4356703 Refrigeration defrost controlExpiredJul 31, 80Nov 02, 82[F25B, F25D]
4334648 Airflow limiter and measurement deviceExpiredOct 27, 80Jun 15, 82[F24F]
4298314 Hermetic compressor having a valve to drain liquid accumulations from its cylinder headExpiredJan 10, 80Nov 03, 81[F04B]
4291757 Multiple heat pump and heat balancing system for multi-stage material processingExpiredMay 28, 80Sep 29, 81[F28D]
4265589 Method and apparatus for surge detection and control in centrifugal gas compressorsExpiredJun 18, 79May 05, 81[F01D]
4262493 Heat pumpExpiredAug 02, 79Apr 21, 81[F25B]
4257318 Variable dead band pressure control systemExpiredApr 30, 79Mar 24, 81[B64D]
4257744 Impeller and shaft assembly for high speed gas compressorExpiredMar 21, 79Mar 24, 81[F16B, F04D]
4248054 Refrigeration system with load balancing control for at least three centrifugal compressorsExpiredFeb 14, 79Feb 03, 81[F04B, F25B]
4236577 Separately removable tubes in heavy duty heat exchanger assembliesExpiredJun 16, 78Dec 02, 80[F28F]
4213307 Oil separation and return system for centrifugal refrigerant compressorsExpiredNov 13, 78Jul 22, 80[F25B]
4211363 Fluidically-controlled air-conditioning systemExpiredFeb 11, 76Jul 08, 80[F24F]

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