David C. Planchard

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Shrewsbury, MA, US

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Patents Grantslast 30 patents

Information Patent Grant
Replacement method and apparatus for a cryogenic refrigeration unit
- Patent number 4,956,974
- Issue date Sep 18, 1990
- Helix Technology Corporation
- David C. Planchard
- F17 - STORING OF DISTRIBUTING GASES OR LIQUIDS
Information Patent Grant
Bypass relief poppet valve
- Patent number 4,932,428
- Issue date Jun 12, 1990
- Helix Technology Corporation
- David C. Planchard
- F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
Information Patent Grant
Replacement method and apparatus for a cryogenic refrigeration unit
- Patent number 4,906,266
- Issue date Mar 6, 1990
- Helix Technology Corporation
- David C. Planchard
- F17 - STORING OF DISTRIBUTING GASES OR LIQUIDS
Information Patent Grant
Cryopump with exhaust filter
- Patent number 4,655,046
- Issue date Apr 7, 1987
- Helix Technology Corporation
- Michael J. Eacobacci
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...