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Patents Grants
last 30 patents
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Patent Grant
Three-phase heat pump
Patent number
4,873,842
Issue date
Oct 17, 1989
Societe Nationale Elf Aquitaine
Didier Payre
F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
Information
Patent Grant
Thermochemical method and device for storing and unstoring heat
Patent number
4,784,217
Issue date
Nov 15, 1988
Societe Nationale Elf Aquitaine
Didier Payre
F28 - HEAT EXCHANGE IN GENERAL
Information
Patent Grant
Three-phase heat pump
Patent number
4,682,476
Issue date
Jul 28, 1987
Societe Nationale Elf Aquitaine
Didier Payre
F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...