Inventor
KREITZER MELVYN H
US43 patents
⚠️ This page may combine multiple inventors who share the name “KREITZER MELVYN H”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
US PRECISION LENS INC
11 patentsUS5870228AFeb 9, 1999
Projection lenses having larger back focal length to focal length ratios
US PRECISION LENS INC128 citations99
US6097551AAug 1, 2000
Lenses for electronic imaging systems
US PRECISION LENS INC104 citations98
US6023375AFeb 8, 2000
Projection lenses for use with large pixelized panels
US PRECISION LENS INC92 citations98
US5969876AOct 19, 1999
Projection lenses having large back focal length to focal length ratios
US PRECISION LENS INC116 citations98
US5963375AOct 5, 1999
Athermal LCD projection lens
US PRECISION LENS INC101 citations98
US5936776AAug 10, 1999
Focusable front projection lens systems for use with large screen formats
US PRECISION LENS INC92 citations98
US5900987AMay 4, 1999
Zoom projection lenses for use with pixelized panels
US PRECISION LENS INC145 citations98
US5900989AMay 4, 1999
Mini-zoom projection lenses for use with pixelized panels
US PRECISION LENS INC99 citations98
US5309283AMay 3, 1994
Hybrid, color-corrected, projection TV lens system
US PRECISION LENS INC110 citations98
US4900139AFeb 13, 1990
Color corrected projection lens
US PRECISION LENS INC31 citations93
US5991089ANov 23, 1999
Long focal length projection lenses for use with large pixelized panels
US PRECISION LENS INC9 citations74
VIVITAR CORP
8 patentsUS4523816AJun 18, 1985
Catadioptric lens
VIVITAR CORP39 citations93
US4256381AMar 17, 1981
Zoom lens
VIVITAR CORP25 citations82
US4333714AJun 8, 1982
Compact wide angle lens
VIVITAR CORP8 citations74
US4307943ADec 29, 1981
Close focusing zoom lens
VIVITAR CORP11 citations74
US4182549AJan 8, 1980
Compact wide angle lens
VIVITAR CORP9 citations74
US4659188AApr 21, 1987
Zoom lens
VIVITAR CORP2 citations63
US4367928AJan 11, 1983
Wide angle lens attachment
VIVITAR CORP2 citations54
US4303315ADec 1, 1981
Compact wide angle lens
VIVITAR CORP0 citations52
EASTMAN KODAK CO
6 patentsUS5493448AFeb 20, 1996
Zoom lens having weak front lens group
EASTMAN KODAK CO90 citations96
US5315440AMay 24, 1994
Zoom lens having weak front lens group
EASTMAN KODAK CO95 citations96
US4828372AMay 9, 1989
Wide-angle zoom lens
EASTMAN KODAK CO34 citations93
US4838668AJun 13, 1989
Zoom lens
EASTMAN KODAK CO14 citations74
US4818082AApr 4, 1989
Compact wide-angle close-focus SLR zoom lens
EASTMAN KODAK CO7 citations74
US4757372AJul 12, 1988
SLR zoom camera
EASTMAN KODAK CO12 citations74
U S PREC LENS INC
4 patentsUS6195209B1Feb 27, 2001
Projection lenses having reduced lateral color for use with pixelized panels
U S PREC LENS INC123 citations99
US6169636B1Jan 2, 2001
Focus corrector for zoom projection lenses used with pixelized panels
U S PREC LENS INC200 citations99
US6529336B1Mar 4, 2003
Color corrected projection lenses employing diffractive optical surfaces
U S PREC LENS INC93 citations98
US6141154AOct 31, 2000
Focusable, color corrected, high performance projection lens systems
U S PREC LENS INC89 citations98
3M INNOVATIVE PROPERTIES CO
3 patentsUS7230770B2Jun 12, 2007
Projection lenses having color-correcting rear lens units
3M INNOVATIVE PROPERTIES CO92 citations98
US7145729B2Dec 5, 2006
Foldable projection lenses
3M INNOVATIVE PROPERTIES CO90 citations98
US6853493B2Feb 8, 2005
Folded, telecentric projection lenses for use with pixelized panels
3M INNOVATIVE PROPERTIES CO139 citations98