Assignee
HELL RUDOLF DR ING GMBH
DE·143 granted patents·2,927 citations·filing 1974–1989
Top patents by PatentIndex Score
143 records- 0194US4414635AMethod and circuit for recognition of colorsHELL RUDOLF DR ING GMBH·Filed 1981·Granted Nov 8, 1983·130 cites·39 claims
- 0291US4623973AMethod and apparatus for the recognition of hues and colorsHELL RUDOLF DR ING GMBH·Filed 1984·Granted Nov 18, 1986·67 cites·23 claims
- 0390US4821114AOpto-electronic scanning arrangementHELL RUDOLF DR ING GMBH·Filed 1987·Granted Apr 11, 1989·85 cites·25 claims
- 0490US4700235AMethod and apparatus for producing half-tone printing forms with rotated screens on the basis of randomly selected screen threshold valuesHELL RUDOLF DR ING GMBH·Filed 1984·Granted Oct 13, 1987·81 cites·15 claims
- 0589US4583116AMethod and apparatus for eliminating defects in images in polychromatic printing due to faulty registration of superimposed printing of color separationsHELL RUDOLF DR ING GMBH·Filed 1983·Granted Apr 15, 1986·63 cites·5 claims
- 0688US4667948AApparatus for isolating offset printing plates and removing intermediate paper layersHELL RUDOLF DR ING GMBH·Filed 1985·Granted May 26, 1987·45 cites·11 claims
- 0788US4639770AMethod and circuit arrangement for simulating a multi-colored reproduction on a color monitorHELL RUDOLF DR ING GMBH·Filed 1984·Granted Jan 27, 1987·55 cites·17 claims
- 0888US4577219AMethod and an apparatus for copying retouch in electronic color picture reproductionHELL RUDOLF DR ING GMBH·Filed 1983·Granted Mar 18, 1986·109 cites·18 claims
- 0988US4284996ADriving ink jet recording elementsHELL RUDOLF DR ING GMBH·Filed 1979·Granted Aug 18, 1981·46 cites·7 claims
- 1087US4328515AMethod and a device for recorrecting standard color corrections in a color picture recordingHELL RUDOLF DR ING GMBH·Filed 1979·Granted May 4, 1982·39 cites·18 claims
- 1187US4084183AMethod for the electro-optical reproduction of half-tone picturesHELL RUDOLF DR ING GMBH·Filed 1975·Granted Apr 11, 1978·59 cites·3 claims
- 1287US4075662AMethod and system for compensating the non-linearities in a reproduction processHELL RUDOLF DR ING GMBH·Filed 1976·Granted Feb 21, 1978·46 cites·9 claims
- 1386US4231069AMethod and apparatus for producing image combinationsHELL RUDOLF DR ING GMBH·Filed 1978·Granted Oct 28, 1980·37 cites·13 claims
- 1486US4110826AApparatus and process for color-identificationHELL RUDOLF DR ING GMBH·Filed 1976·Granted Aug 29, 1978·46 cites·21 claims
- 1586US4075663AMethod for the rastered reproduction of half-tone pictures providing changes in the individual picture elements during transfer from an original to a reproductionHELL RUDOLF DR ING GMBH·Filed 1976·Granted Feb 21, 1978·36 cites·15 claims
- 1685US4590515AMethod and apparatus for modifying color reduction depending on toneHELL RUDOLF DR ING GMBH·Filed 1983·Granted May 20, 1986·40 cites·10 claims
- 1785US4482917AMethod for a reproduction of colored masters in four-color printing using color reductionHELL RUDOLF DR ING GMBH·Filed 1982·Granted Nov 13, 1984·63 cites·9 claims
- 1884US4349279AMethod for the color evaluation of pattern models of fabric, _decoration or packaging printing, and a color evaluation deviceHELL RUDOLF DR ING GMBH·Filed 1979·Granted Sep 14, 1982·31 cites·22 claims
- 1983US4568984AMethod and apparatus for scanning mastersHELL RUDOLF DR ING GMBH·Filed 1983·Granted Feb 4, 1986·37 cites·20 claims
- 2083US4393399AMethod and apparatus for partial electronic retouching of colorsHELL RUDOLF DR ING GMBH·Filed 1980·Granted Jul 12, 1983·44 cites·31 claims
- 2183US4121259AMethod for digital run-length coding with redundance reduction for transmission of binarily coded picture informationsHELL RUDOLF DR ING GMBH·Filed 1976·Granted Oct 17, 1978·53 cites·17 claims
- 2283US4013829AMethod for the production of printing formsHELL RUDOLF DR ING GMBH·Filed 1976·Granted Mar 22, 1977·40 cites·19 claims
- 2383US3975761AMethod and arrangement for the avoidance of errors during the reproduction of an image patternHELL RUDOLF DR ING GMBH·Filed 1975·Granted Aug 17, 1976·30 cites·10 claims
- 2481US4718629AVacuum holding deviceHELL RUDOLF DR ING GMBH·Filed 1986·Granted Jan 12, 1988·23 cites·9 claims
- 2581US4561016AMethod and apparatus for recording color pictures for multicolor printingHELL RUDOLF DR ING GMBH·Filed 1983·Granted Dec 24, 1985·47 cites·23 claims
- 2681US4476487AMethod and circuit arrangement for partial electronic retouch in color image reproductionHELL RUDOLF DR ING GMBH·Filed 1980·Granted Oct 9, 1984·34 cites·14 claims
- 2781US4285009AApparatus for producing corrected color chromatic componentsHELL RUDOLF DR ING GMBH·Filed 1979·Granted Aug 18, 1981·32 cites·6 claims
- 2880US4516175AScanning method and scanning diaphragm for suppressing Moire in the scanning of rastered mastersHELL RUDOLF DR ING GMBH·Filed 1982·Granted May 7, 1985·33 cites·6 claims
- 2980US4500791AHigh stability electron beam generator for processing materialHELL RUDOLF DR ING GMBH·Filed 1980·Granted Feb 19, 1985·20 cites·6 claims
- 3079US4240118AMethod for electro-optically sensing, transmitting pictorial informationHELL RUDOLF DR ING GMBH·Filed 1978·Granted Dec 16, 1980·26 cites·1 claims
- 3179US4054916AApparatus for improving sharpness when recording continuous-tone picturesHELL RUDOLF DR ING GMBH·Filed 1974·Granted Oct 18, 1977·19 cites·5 claims
- 3278US4315285AMethods for converting a video signal into a black/white signalHELL RUDOLF DR ING GMBH·Filed 1979·Granted Feb 9, 1982·27 cites·12 claims
- 3378US3964382AEngraving device for a printing form engraving machineHELL RUDOLF DR ING GMBH·Filed 1974·Granted Jun 22, 1976·40 cites·12 claims
- 3477US4467205AHighly-steady beam generating for charged particlesHELL RUDOLF DR ING GMBH·Filed 1982·Granted Aug 21, 1984·19 cites·5 claims
- 3577US4307962ADetermination of the standard color values of colors represented on a color monitorHELL RUDOLF DR ING GMBH·Filed 1979·Granted Dec 29, 1981·21 cites·9 claims
- 3676US4189742AApparatus for indicating overcorrections, in electrical color correction apparatusHELL RUDOLF DR ING GMBH·Filed 1978·Granted Feb 19, 1980·23 cites·7 claims
- 3776US4136360AApparatus including a circuit arrangement for adjusting the color signal levels of a white dotHELL RUDOLF DR ING GMBH·Filed 1976·Granted Jan 23, 1979·23 cites·5 claims
- 3875US4668979AProduction of color separations for single color printing in which separation hues and colors are optimally defined with respect to hue, color separation, and luminanceHELL RUDOLF DR ING GMBH·Filed 1984·Granted May 26, 1987·31 cites·19 claims
- 3975US4404596AMethod and apparatus for the correction of the position error of a multifaceted rotating mirrorHELL RUDOLF DR ING GMBH·Filed 1981·Granted Sep 13, 1983·31 cites·23 claims
- 4074US4691229AApparatus for checking color pictures on a color monitorHELL RUDOLF DR ING GMBH·Filed 1984·Granted Sep 1, 1987·27 cites·4 claims
- 4174US4484232AMethod and circuit arrangement for contrast intensificationHELL RUDOLF DR ING GMBH·Filed 1982·Granted Nov 20, 1984·24 cites·19 claims
- 4274US4363037AApparatus and process for recording an image free of line structureHELL RUDOLF DR ING GMBH·Filed 1980·Granted Dec 7, 1982·24 cites·7 claims
- 4374US3997828ACopy-repeater arrangement and method of adjusting the sameHELL RUDOLF DR ING GMBH·Filed 1974·Granted Dec 14, 1976·22 cites·9 claims
- 4473US4649423AMethod and circuit arrangement for selective correction of hues and colorsHELL RUDOLF DR ING GMBH·Filed 1984·Granted Mar 10, 1987·23 cites·17 claims
- 4573US4551751AColor reduction dependent on toneHELL RUDOLF DR ING GMBH·Filed 1983·Granted Nov 5, 1985·20 cites·5 claims
- 4673US4464677AMethod and circuit arrangement for partial recorrection of color recognition spaces in color recognitionHELL RUDOLF DR ING GMBH·Filed 1981·Granted Aug 7, 1984·30 cites·35 claims
- 4772US4667247AMethod and apparatus for checking the quality of composings for printing products, in particular newspapersHELL RUDOLF DR ING GMBH·Filed 1984·Granted May 19, 1987·27 cites·9 claims
- 4872US4257070AMethod for converting a video signal into a black/white signalHELL RUDOLF DR ING GMBH·Filed 1979·Granted Mar 17, 1981·20 cites·25 claims
- 4971US5128879AMethod and apparatus for acquiring covering data of print areasHELL RUDOLF DR ING GMBH·Filed 1989·Granted Jul 7, 1992·19 cites·7 claims
- 5071US4245260AMethod for improved reproduction of edges by engraving screened printing formsHELL RUDOLF DR ING GMBH·Filed 1978·Granted Jan 13, 1981·19 cites·18 claims
Showing the top 50 of 143 patent records by PatentIndex Score.
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