Columbia Gas Service Corporation

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
F25B REFRIGERATION MACHINES, PLANTS, OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS 266

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
RE34747 Absorption refrigeration and heat pump system with defrostAug 31, 92Oct 04, 94[F25B]
RE34600 Energy recovery system for absorption heat pumpsAug 31, 92May 10, 94[F25B]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5126654 Non-invasive, high resolution detection of electrical currents and electrochemical impedances at spaced localities along a pipelineExpiredApr 02, 90Jun 30, 92[G01N]
5087873 Non-invasive, high resolution detection of electrical currents and electrochemical impedances at spaced localities along a pipelineExpiredApr 24, 91Feb 11, 92[G01N, C23F]
5077986 Energy recovery system for absorption heat pumpsExpiredFeb 09, 90Jan 07, 92[F25B]
5067330 Heat transfer apparatus for heat pumpsExpiredFeb 09, 90Nov 26, 91[F25B]
4972679 Absorption refrigeration and heat pump system with defrostExpiredFeb 09, 90Nov 27, 90[F25B]
4891008 High temperature convection furnaceExpiredMay 21, 86Jan 02, 90[F27B]
4830610 High temperature convection furnaceExpiredJun 15, 88May 16, 89[F27B]
4783990 Apparatus for measuring the quantity of gas pumped by a compressorExpiredJun 29, 87Nov 15, 88[G01M]
4773255 Apparatus for injecting gas into a pipelineExpiredJun 19, 87Sep 27, 88[G01M]
4742687 Dual cooling/heating process and compositionExpiredDec 22, 86May 10, 88[F25B]
4742693 Absorption refrigeration and heat pump systemExpiredDec 22, 86May 10, 88[F25B]
4722193 Absorption refrigeration and heat pump systemExpiredDec 22, 86Feb 02, 88[F25B]
4719767 Absorption refrigeration and heat pump systemExpiredDec 22, 86Jan 19, 88[F25B]
4691532 Dual cooling/heating system energy recoveryExpiredDec 22, 86Sep 08, 87[F25B]
4690689 Gas tracer composition and methodExpiredOct 24, 85Sep 01, 87[G01N, B65G]
4676095 Apparatus for measuring the work performed by a gas compressorExpiredNov 22, 85Jun 30, 87[G01M]
4658750 Apparatus and method for detecting gas bubbles in water, and apparatus for handling an oceanographic deviceExpiredDec 09, 85Apr 21, 87[B63G]
4646541 Absorption refrigeration and heat pump systemExpiredNov 13, 84Mar 03, 87[F25B]
4641588 Heat shieldExpiredJul 08, 85Feb 10, 87[F23J]
4641631 Apparatus and method for burning a combustible gas, and a heat exchanger for use in this apparatusExpiredSep 09, 85Feb 10, 87[F24D]

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