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David Preston Simpson

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  • Chester, EN
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Patents Grantslast 30 patents

  • Information Patent Grant

    Method and apparatus for increasing contact area in a multi-phase s...
    • Patent number 4,085,170
    • Issue date Apr 18, 1978
    • The Electricity Council
    • David Preston Simpson
    • G10 - MUSICAL INSTRUMENTS ACOUSTICS
  • Information Patent Grant

    Boilers
    • Patent number 4,077,465
    • Issue date Mar 7, 1978
    • The Electricity Council
    • David Preston Simpson
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • Information Patent Grant

    Treatment of material by ultra-violet irradiation
    • Patent number 3,987,306
    • Issue date Oct 19, 1976
    • The Electricity Council
    • David Preston Simpson
    • C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • Information Patent Grant

    Production of ultra-violet radiation
    • Patent number 3,942,018
    • Issue date Mar 2, 1976
    • The Electricity Council
    • David Preston Simpson
    • C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE