COLUMBIA GAS OF OHIO, INC.

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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 366
 
 
 
G01F MEASURING VOLUME, VOLUME FLOW, MASS FLOW, OR LIQUID LEVEL; METERING BY VOLUME 156
 
 
 
G01K MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR 142
 
 
 
G01L MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE 155
 
 
 
G01M TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR166
 
 
 
G01N INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES 1192
 
 
 
G01S RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES1104

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5645348 Method and apparatus for measuring pressure in a pipeline without tappingJun 20, 94Jul 08, 97[G01F, G01K, G01N, G01L]
5546760 Generator for absorption heat pumpsJun 07, 95Aug 20, 96[F25B]
5533362 Heat transfer apparatus for heat pumpsAug 19, 94Jul 09, 96[F25B]
5412989 Acoustic tracing of buried conduitsDec 28, 92May 09, 95[G01S]
5361636 Apparatus and process for measuring the magnitude of leaksSep 23, 92Nov 08, 94[G01M]
5339654 Heat transfer apparatusOct 09, 91Aug 23, 94[F25B]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5980102 Method for measuring physical characteristics in a pipeline without tappingExpiredDec 16, 96Nov 09, 99[G01K, G01N]
5836693 Method and apparatus for measuring pressure in a pipeline without tappingExpiredFeb 23, 96Nov 17, 98[G01N]
5769033 Hot water storageExpiredJan 22, 96Jun 23, 98[H05B, F22B]

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