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Class Information
Number: 399/180
Name: Electrophotography > Image formation > Exposure > Formation of color separation images > Having halftone screen
Description: Subject matter wherein a means or method is provided that reproduces an original image in lines, segments, or dots by enabling an original to appear as if it were projected through a screen having a lattice of parallel lines at a specified angle.

Patents under this class:

Patent Number Title Of Patent Date Issued
8665487 Calibration of half-tone densities in printers Mar. 4, 2014
8643910 Image forming apparatus and image forming method including a first measuring unit that measures invisible toner Feb. 4, 2014
8576451 Versatile moire-free halftone geometry that uses frequency vector shearing Nov. 5, 2013
8208175 Blended error diffusion and adaptive quantization Jun. 26, 2012
8175483 Image forming apparatus and gradation correction test chart May. 8, 2012
8125665 Image-processing system, control method, program, and storage medium Feb. 28, 2012
7684736 Image forming method, screen set and image forming apparatus Mar. 23, 2010
7215444 Systems and methods for designing zero-shift supercell halftone screens May. 8, 2007
6606470 Color plane partial exposure for reducing edge effect Aug. 12, 2003
5786843 Two-dimensional modulation for line screen printing Jul. 28, 1998
5134439 Exposure compensation system for a dual mode electrophotographic print engine Jul. 28, 1992
4901104 Image recording apparatus Feb. 13, 1990
4888636 Image reproducing system Dec. 19, 1989
4791450 Multicolor electrophotographic reproduction apparatus and method for producing color accented copies Dec. 13, 1988
4783680 Halftone screening system for printer/copier Nov. 8, 1988
4674856 Image formation apparatus Jun. 23, 1987
4668978 Thermal transfer color image forming apparatus with image color and image color density control functions May. 26, 1987
RE32259 Method and means for improving maximum density and tonal range of electrographic images Oct. 7, 1986
4157869 Transparency reproducing machine Jun. 12, 1979
4120580 Collating system for slide reproduction Oct. 17, 1978
4111540 Field lens for an electrophotographic printing machine Sep. 5, 1978
4095889 Exposure system for an electrophotographic printing machine Jun. 20, 1978
4090786 Multi-color screen for electrophotographic printing May. 23, 1978
4083632 Multi-frequency screen Apr. 11, 1978
4072414 Screen for an electrophotographic printing machine Feb. 7, 1978
4068939 Color transparency reproducing machine Jan. 17, 1978
4068940 Variable contrast optical screening system Jan. 17, 1978
4066353 Half tone imaging system Jan. 3, 1978
4066351 Variable illumination optical system Jan. 3, 1978
4063810 Color transparency reproducing machine Dec. 20, 1977
4053217 Color transparency reproducing machine Oct. 11, 1977
4013355 Notch filter for color transparency copying machines Mar. 22, 1977
4012137 Optical system having a rotating screen Mar. 15, 1977
4007981 Dual mode electrostatographic printing machine Feb. 15, 1977
3967894 Screened optical system Jul. 6, 1976
3963342 Curved screen Jun. 15, 1976
3961847 Arcuate screen for an electrophotographic printing machine Jun. 8, 1976
3961848 Electrophotographic printing machine with halftone screen cleaning Jun. 8, 1976
3958877 Half-tone screen with cleaning means for an electrophotographic printing machine May. 25, 1976

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