Assignee
COLUMBIA GAS SERVICE CORP
US·4 granted patents·34 citations·filing 1975–1992
Top patents by PatentIndex Score
4 records- 0168US4972679AAbsorption refrigeration and heat pump system with defrostCOLUMBIA GAS SERVICE CORP·Filed 1990·Granted Nov 27, 1990·21 cites·15 claims
- 0230US3974694ARemote digital indicator attachment for a gas meterCOLUMBIA GAS SERVICE CORP·Filed 1975·Granted Aug 17, 1976·6 cites·6 claims
- 0328USRE34747EAbsorption refrigeration and heat pump system with defrostCOLUMBIA GAS SERVICE CORP·Filed 1992·Granted Oct 4, 1994·7 cites·15 claims
- 0428USRE34600EEnergy recovery system for absorption heat pumpsCOLUMBIA GAS SERVICE CORP·Filed 1992·Granted May 10, 1994·0 cites·4 claims
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