Assignee
TROPEL CORP
US·22 granted patents·901 citations·filing 1993–2000
Top patents by PatentIndex Score
22 records- 0196US6191887B1Laser illumination with speckle reductionTROPEL CORP·Filed 2000·Granted Feb 20, 2001·269 cites·27 claims
- 0293US5353322ALens system for X-ray projection lithography cameraTROPEL CORP·Filed 1993·Granted Oct 4, 1994·103 cites·10 claims
- 0389US5416586AMethod of testing aspherical optical surfaces with an interferometerTROPEL CORP·Filed 1993·Granted May 16, 1995·75 cites·24 claims
- 0486US6560039B1Double mirror catadioptric objective lens system with three optical surface multifunction componentTROPEL CORP·Filed 2000·Granted May 6, 2003·58 cites·11 claims
- 0586US5650877AImaging system for deep ultraviolet lithographyTROPEL CORP·Filed 1995·Granted Jul 22, 1997·89 cites·30 claims
- 0683US5923425AGrazing incidence interferometry for measuring transparent plane-parallel platesTROPEL CORP·Filed 1997·Granted Jul 13, 1999·57 cites·30 claims
- 0776US5757493AInterferometer with catadioptric imaging system having expanded range of numerical apertureTROPEL CORP·Filed 1996·Granted May 26, 1998·50 cites·34 claims
- 0871US5982475ARaster-scan photolithographic reduction systemTROPEL CORP·Filed 1997·Granted Nov 9, 1999·30 cites·37 claims
- 0968US5654798AInterferometric measurement of surfaces with diffractive optics at grazing incidenceTROPEL CORP·Filed 1995·Granted Aug 5, 1997·26 cites·34 claims
- 1067US5909282AInterferometer for measuring thickness variations of semiconductor wafersTROPEL CORP·Filed 1997·Granted Jun 1, 1999·31 cites·22 claims
- 1159US5991035AInterferometric method of measuring toric surfaces at grazing incidenceTROPEL CORP·Filed 1999·Granted Nov 23, 1999·16 cites·9 claims
- 1256US5793488AInterferometer with compound optics for measuring cylindrical objects at oblique incidenceTROPEL CORP·Filed 1995·Granted Aug 11, 1998·21 cites·66 claims
- 1352US6456384B1Moiré interferometer with overlapping illumination and imaging systemsTROPEL CORP·Filed 2000·Granted Sep 24, 2002·7 cites·42 claims
- 1448US5777738AInterferometric measurement of absolute dimensions of cylindrical surfaces at grazing incidenceTROPEL CORP·Filed 1997·Granted Jul 7, 1998·14 cites·34 claims
- 1546US5889591AInterferometric measurement of toric surfaces at grazing incidenceTROPEL CORP·Filed 1996·Granted Mar 30, 1999·9 cites·28 claims
- 1645US5719676ADiffraction management for grazing incidence interferometerTROPEL CORP·Filed 1996·Granted Feb 17, 1998·12 cites·73 claims
- 1741US5724137AFringe pattern discriminator for interferometer using diffraction gratingsTROPEL CORP·Filed 1996·Granted Mar 3, 1998·10 cites·13 claims
- 1836US6043886AInterferometric method of measuring toric surfaces at grazing incidence with phase shiftingTROPEL CORP·Filed 1999·Granted Mar 28, 2000·4 cites·6 claims
- 1935US5532821ATesting of recessed surfaces at grazing incidenceTROPEL CORP·Filed 1995·Granted Jul 2, 1996·6 cites·43 claims
- 2033US5909281AInterferometric measurement of surfaces with diffractive optics and planar wavefront imagingTROPEL CORP·Filed 1997·Granted Jun 1, 1999·3 cites·19 claims
- 2132US5349434AMethod of measuring artifact taperTROPEL CORP·Filed 1993·Granted Sep 20, 1994·4 cites·27 claims
- 2228US5684594AObject fixturing in interferometerTROPEL CORP·Filed 1996·Granted Nov 4, 1997·7 cites·32 claims
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