TREA

Duane P. Littlejohn

Follow

Person

  • Manlius, NY, US
People

Patents Grantslast 30 patents

  • Information Patent Grant

    Automatic background ejection (ABE)
    • Patent number 6,608,304
    • Issue date Aug 19, 2003
    • Siemens Energy & Automation
    • Duane P. Littlejohn
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Triode ion pump
    • Patent number 6,498,344
    • Issue date Dec 24, 2002
    • Siemens Energy & Automation, Inc.
    • Duane P. Littlejohn
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Method for forming a seat in a pulsed sampling valve
    • Patent number 6,355,929
    • Issue date Mar 12, 2002
    • Siemens Energy & Automation, Inc.
    • Duane P. Littlejohn
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Programmed electron flux
    • Patent number 6,255,648
    • Issue date Jul 3, 2001
    • Applied Automation, Inc.
    • Duane P. Littlejohn
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Ion pump relay control
    • Patent number 6,232,599
    • Issue date May 15, 2001
    • Siemens Aktiengesellschaft
    • Duane P. Littlejohn
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Precision pressure monitor
    • Patent number 6,225,624
    • Issue date May 1, 2001
    • Siemens Aktiengesellschaft
    • Duane P. Littlejohn
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Pulsed mass spectrometer leak valve with controlled energy closure
    • Patent number 6,121,609
    • Issue date Sep 19, 2000
    • Siemens Aktiengesellschaft
    • Duane P. Littlejohn
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Fourier transform molecular spectrometer
    • Patent number 5,233,190
    • Issue date Aug 3, 1993
    • Leybold Inficon Inc.
    • Fritz H. Schlereth
    • G01 - MEASURING TESTING