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TROPEL CORP
US22 patents
Top patents by PatentIndex Score
US6191887B1Feb 20, 2001
Laser illumination with speckle reduction
TROPEL CORP269 citations96
US5923425AJul 13, 1999
Grazing incidence interferometry for measuring transparent plane-parallel plates
TROPEL CORP57 citations95
US5416586AMay 16, 1995
Method of testing aspherical optical surfaces with an interferometer
TROPEL CORP75 citations94
US5353322AOct 4, 1994
Lens system for X-ray projection lithography camera
TROPEL CORP103 citations94
US5650877AJul 22, 1997
Imaging system for deep ultraviolet lithography
TROPEL CORP89 citations93
US5982475ANov 9, 1999
Raster-scan photolithographic reduction system
TROPEL CORP30 citations92
US5654798AAug 5, 1997
Interferometric measurement of surfaces with diffractive optics at grazing incidence
TROPEL CORP26 citations92
US5909282AJun 1, 1999
Interferometer for measuring thickness variations of semiconductor wafers
TROPEL CORP31 citations91
US6560039B1May 6, 2003
Double mirror catadioptric objective lens system with three optical surface multifunction component
TROPEL CORP58 citations90
US5793488AAug 11, 1998
Interferometer with compound optics for measuring cylindrical objects at oblique incidence
TROPEL CORP21 citations90
US5757493AMay 26, 1998
Interferometer with catadioptric imaging system having expanded range of numerical aperture
TROPEL CORP50 citations88
US5991035ANov 23, 1999
Interferometric method of measuring toric surfaces at grazing incidence
TROPEL CORP16 citations82
US5889591AMar 30, 1999
Interferometric measurement of toric surfaces at grazing incidence
TROPEL CORP9 citations74
US5777738AJul 7, 1998
Interferometric measurement of absolute dimensions of cylindrical surfaces at grazing incidence
TROPEL CORP14 citations72
US5719676AFeb 17, 1998
Diffraction management for grazing incidence interferometer
TROPEL CORP12 citations72
US5724137AMar 3, 1998
Fringe pattern discriminator for interferometer using diffraction gratings
TROPEL CORP10 citations71
US6456384B1Sep 24, 2002
Moiré interferometer with overlapping illumination and imaging systems
TROPEL CORP7 citations70
US6043886AMar 28, 2000
Interferometric method of measuring toric surfaces at grazing incidence with phase shifting
TROPEL CORP4 citations63
US5909281AJun 1, 1999
Interferometric measurement of surfaces with diffractive optics and planar wavefront imaging
TROPEL CORP3 citations63
US5684594ANov 4, 1997
Object fixturing in interferometer
TROPEL CORP7 citations63
US5532821AJul 2, 1996
Testing of recessed surfaces at grazing incidence
TROPEL CORP6 citations61
US5349434ASep 20, 1994
Method of measuring artifact taper
TROPEL CORP4 citations55