Inventor · disambiguated record
Donald J. Douglas
Also filed as: DOUGLAS DONALD · DOUGLAS DONALD J
19 granted patents·2 pending applications·1,147 citations·filing 1983–2007
96Inventor score
Top patents by PatentIndex Score
21 records- 0199US4963736AMass spectrometer and method and improved ion transmissionMDS HEALTH GROUP LTD·Filed 1989·Granted Oct 16, 1990·252 cites·24 claims
- 0298US5179278AMultipole inlet system for ion trapsMDS HEALTH GROUP LTD·Filed 1991·Granted Jan 12, 1993·216 cites·12 claims
- 0397US5381008AMethod of plasma mass analysis with reduced space charge effectsMDS HEALTH GROUP LTD·Filed 1993·Granted Jan 10, 1995·136 cites·29 claims
- 0492US4501965AMethod and apparatus for sampling a plasma into a vacuum chamberMDS HEALTH GROUP LTD·Filed 1983·Granted Feb 26, 1985·42 cites·23 claims
- 0591US6833544B1Method and apparatus for multiple stages of mass spectrometryUNIV BRITISH COLUMBIA·Filed 1999·Granted Dec 21, 2004·80 cites·45 claims
- 0690US4746794AMass analyzer system with reduced driftMDS HEALTH GROUP LTD·Filed 1986·Granted May 24, 1988·58 cites·13 claims
- 0789US5248875AMethod for increased resolution in tandem mass spectrometryMDS HEALTH GROUP LTD·Filed 1992·Granted Sep 28, 1993·83 cites·36 claims
- 0887US7045797B2Axial ejection with improved geometry for generating a two-dimensional substantially quadrupole fieldUNIV BRITISH COLUMBIA·Filed 2003·Granted May 16, 2006·33 cites·20 claims
- 0986US5565679AMethod and apparatus for plasma mass analysis with reduced space charge effectsMDS HEALTH GROUP LTD·Filed 1994·Granted Oct 15, 1996·50 cites·25 claims
- 1085US6897438B2Geometry for generating a two-dimensional substantially quadrupole fieldUNIV BRITISH COLUMBIA·Filed 2002·Granted May 24, 2005·36 cites·74 claims
- 1184US7141789B2Method and apparatus for providing two-dimensional substantially quadrupole fields having selected hexapole componentsMDS INC·Filed 2004·Granted Nov 28, 2006·24 cites·62 claims
- 1284US4682026AMethod and apparatus having RF biasing for sampling a plasma into a vacuum chamberMDS HEALTH GROUP LTD·Filed 1986·Granted Jul 21, 1987·32 cites·19 claims
- 1381US7366339B2System and method for detecting cheque fraudELECTRONIC IMAGING SYSTEMS COR·Filed 2006·Granted Apr 29, 2008·23 cites·12 claims
- 1480US7399961B2High throughput ion source with multiple ion sprayers and ion lensesUNIV BRITISH COLUMBIA·Filed 2001·Granted Jul 15, 2008·19 cites·78 claims
- 1579US6191417B1Mass spectrometer including multiple mass analysis stages and method of operation, to give improved resolutionUNIV BRITISH COLUMBIA·Filed 1998·Granted Feb 20, 2001·36 cites·20 claims
- 1671US7709786B2Method of operating quadrupoles with added multipole fields to provide mass analysis in islands of stabilityUNIV BRITISH COLUMBIA·Filed 2007·Granted May 4, 2010·4 cites·14 claims
- 1765US7541579B2Linear quadrupoles with added hexapole fields and method of building and operating sameUNIV BRITISH COLUMBIA·Filed 2007·Granted Jun 2, 2009·2 cites·58 claims
- 1863US6054709AMethod and apparatus for determining the rates of reactions in liquids by mass spectrometryUNIV BRITISH COLUMBIA·Filed 1997·Granted Apr 25, 2000·18 cites·19 claims
- 1957US7067804B2Atmospheric pressure ion lens for generating a larger and more stable ion fluxUNIV BRITISH COLUMBIA·Filed 2001·Granted Jun 27, 2006·3 cites·62 claims
- 2052US2004071333A1System and method for detecting cheque fraudELECTRONIC IMAGING SYSTEMS COR·Filed 2002·Application pending·0 cites
- 2141US2006118716A1Ion excitation in a linear ion trap with a substantially quadrupole field having an added hexapole or higher order fieldUNIV BRITISH COLUMBIA·Filed 2005·Application pending·0 cites
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →