DL

Duane P. Littlejohn

NI Nicolet Instrument: 4 patents #3 of 74Top 5%
SA Siemens Aktiengesellschaft: 3 patents #4,667 of 22,248Top 25%
SA Siemens Energy & Automation: 3 patents #86 of 424Top 25%
AA Applied Automation: 1 patents #4 of 13Top 35%
LI Leybold Inficon: 1 patents #12 of 23Top 55%
📍 Madison, WI: #390 of 4,527 inventorsTop 9%
🗺 Wisconsin: #3,803 of 40,088 inventorsTop 10%
Overall (All Time): #427,366 of 4,157,543Top 15%
12
Patents All Time

Issued Patents All Time

Showing 1–12 of 12 patents

Patent #TitleCo-InventorsDate
6608304 Automatic background ejection (ABE) Thomas Knudsen 2003-08-19
6498344 Triode ion pump 2002-12-24
6355929 Method for forming a seat in a pulsed sampling valve W. Peter Schubert 2002-03-12
6255648 Programmed electron flux Robert W. Arnold 2001-07-03
6232599 Ion pump relay control 2001-05-15
6225624 Precision pressure monitor Robert W. Arnold 2001-05-01
6121609 Pulsed mass spectrometer leak valve with controlled energy closure 2000-09-19
5233190 Fourier transform molecular spectrometer Fritz H. Schlereth, James E. Phillips 1993-08-03
4739165 Mass spectrometer with remote ion source Sahba Ghaderi, Othman Vosburger, Juda L. Shohet 1988-04-19
4668864 Mass spectrometer Sahba Ghaderi 1987-05-26
4588888 Mass spectrometer having magnetic trapping Sahba Ghaderi, Juda L. Shohet 1986-05-13
4581533 Mass spectrometer and method Sahba Ghaderi 1986-04-08