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Martval J. Hartig

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  • Wilmington, DE, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Method for making welded hollow plastic plate heat exchangers
    • Patent number 4,820,468
    • Issue date Apr 11, 1989
    • Martval J. Hartig
    • B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
  • Information Patent Grant

    Falling film evaporator
    • Patent number 4,424,098
    • Issue date Jan 3, 1984
    • E. I. Du Pont de Nemours and Company
    • Martval J. Hartig
    • F28 - HEAT EXCHANGE IN GENERAL
  • Information Patent Grant

    Water evaporation process
    • Patent number 4,341,601
    • Issue date Jul 27, 1982
    • E. I. Du Pont de Nemours and Company
    • Martval J. Hartig
    • F28 - HEAT EXCHANGE IN GENERAL
  • Information Patent Grant

    Reinforced optical fiber cable with glass or silica core
    • Patent number 4,331,378
    • Issue date May 25, 1982
    • E. I. Du Pont de Nemours and Company
    • Martval J. Hartig
    • G02 - OPTICS
  • Information Patent Grant

    Jacketed optical filamentary material with thermoplastic core
    • Patent number 4,261,936
    • Issue date Apr 14, 1981
    • E. I. Du Pont de Nemours and Company
    • Martval J. Hartig
    • B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
  • Information Patent Grant

    Hot air heater
    • Patent number 4,069,807
    • Issue date Jan 24, 1978
    • E. I. Du Pont de Nemours and Company
    • Martval John Hartig
    • F24 - HEATING RANGES VENTILATING
  • Information Patent Grant

    Apparatus and process
    • Patent number 3,941,546
    • Issue date Mar 2, 1976
    • E. I. Du Pont de Nemours and Company
    • Martval John Hartig
    • B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL