Inventor · disambiguated record
John C. Helmer
Also filed as: HELMER JOHN C · HELMER JOHN COLVILLE
16 granted patents·1,052 citations·filing 1976–2008
95Inventor score
Top patents by PatentIndex Score
16 records- 0198US5482611APhysical vapor deposition employing ion extraction from a plasmaFiled 1993·Granted Jan 9, 1996·308 cites·29 claims
- 0297US5252194ARotating sputtering apparatus for selected erosionVARIAN ASSOCIATES·Filed 1992·Granted Oct 12, 1993·181 cites·28 claims
- 0397US4995958ASputtering apparatus with a rotating magnet array having a geometry for specified target erosion profileVARIAN ASSOCIATES·Filed 1989·Granted Feb 26, 1991·103 cites·9 claims
- 0494US5330628ACollimated deposition apparatus and methodVARIAN ASSOCIATES·Filed 1991·Granted Jul 19, 1994·110 cites·15 claims
- 0590US4774437AInverted re-entrant magnetron ion sourceVARIAN ASSOCIATES·Filed 1986·Granted Sep 27, 1988·45 cites·14 claims
- 0689US6024843ASputtering apparatus with a rotating magnet array having a geometry for specified target erosion profileNOVELLUS SYSTEMS INC·Filed 1992·Granted Feb 15, 2000·62 cites·31 claims
- 0786US4437812ASingle-pump multiple stroke proportioning for gradient elution liquid chromatographyVARIAN ASSOCIATES·Filed 1981·Granted Mar 20, 1984·59 cites·14 claims
- 0885US4606806AMagnetron sputter device having planar and curved targetsVARIAN ASSOCIATES·Filed 1985·Granted Aug 19, 1986·35 cites·57 claims
- 0985US4043906AMethod and apparatus for reducing the transient effects of liquid compressibility in a liquid chromatography systemVARIAN ASSOCIATES·Filed 1976·Granted Aug 23, 1977·36 cites·24 claims
- 1079US8070419B2Spiral pumping stage and vacuum pump incorporating such pumping stageHELMER JOHN C·Filed 2008·Granted Dec 6, 2011·12 cites·16 claims
- 1173US5235409AOptical detection system for capillary separation columnsVARIAN ASSOCIATES·Filed 1991·Granted Aug 10, 1993·39 cites·22 claims
- 1268US8152442B2Centripetal pumping stage and vacuum pump incorporating such pumping stageHELMER JOHN C·Filed 2008·Granted Apr 10, 2012·5 cites·18 claims
- 1368US5635036ACollimated deposition apparatus and methodVARIAN ASSOCIATES·Filed 1993·Granted Jun 3, 1997·28 cites·19 claims
- 1454US4629548APlanar penning magnetron sputtering deviceVARIAN ASSOCIATES·Filed 1985·Granted Dec 16, 1986·8 cites·6 claims
- 1552US5456575ANon-centric improved pumping stage for turbomolecular pumpsVARIAN ASSOCIATES·Filed 1994·Granted Oct 10, 1995·19 cites·11 claims
- 1628US5449270ATangential flow pumping channel for turbomolecular pumpsVARIAN ASSOCIATES·Filed 1994·Granted Sep 12, 1995·2 cites·5 claims
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