Assignee
GRETAG AG
CH·85 granted patents·2,416 citations·filing 1964–1996
Top patents by PatentIndex Score
85 records- 0198US4975862AProcess and apparatus for the ink control of a printing machineGRETAG AG·Filed 1989·Granted Dec 4, 1990·89 cites·23 claims
- 0298US4311914AProcess for assessing the quality of a printed productGRETAG AG·Filed 1979·Granted Jan 19, 1982·262 cites·18 claims
- 0398US4145040AGripper drumGRETAG AG·Filed 1977·Granted Mar 20, 1979·80 cites·5 claims
- 0497US4671661AProcess, apparatus and color measuring strip for evaluating print qualityGRETAG AG·Filed 1984·Granted Jun 9, 1987·59 cites·25 claims
- 0597US4660159AProcess and apparatus for the regulation of ink feed controls in an offset printing machineGRETAG AG·Filed 1984·Granted Apr 21, 1987·50 cites·35 claims
- 0697US4101216AMethod and apparatus for print exposure controlGRETAG AG·Filed 1976·Granted Jul 18, 1978·45 cites·18 claims
- 0797US3990558AMethod and apparatus for preparing and assessing payment documentsGRETAG AG·Filed 1974·Granted Nov 9, 1976·110 cites·8 claims
- 0896US5068810AProcess for the determination of colorimetric differences between two screen pattern fields printed by a printing machine and process for the color control or ink regulation of the print of a printing machineGRETAG AG·Filed 1990·Granted Nov 26, 1991·59 cites·7 claims
- 0996US4665496AProcess and apparatus for the evaluation of the printing quality of a printed product by an offset printing machineGRETAG AG·Filed 1984·Granted May 12, 1987·46 cites·34 claims
- 1096US4145568AMethod and apparatus for ciphering and deciphering messagesGRETAG AG·Filed 1964·Granted Mar 20, 1979·68 cites·14 claims
- 1195US4649502AProcess and apparatus for evaluating printing quality and for regulating the ink feed controls in an offset printing machineGRETAG AG·Filed 1984·Granted Mar 10, 1987·84 cites·42 claims
- 1295US4505589AProcess and apparatus for the colorimetric analysis of printed materialGRETAG AG·Filed 1982·Granted Mar 19, 1985·157 cites·31 claims
- 1394US4967379AProcess for the ink control or regulation of a printing machine by comparing desired color to obtainable color dataGRETAG AG·Filed 1988·Granted Oct 30, 1990·39 cites·29 claims
- 1493US4574692AProcess and apparatus for the preparation of photographic copiesGRETAG AG·Filed 1984·Granted Mar 11, 1986·61 cites·11 claims
- 1593US4251156AMethod of and apparatus for making photographic printsGRETAG AG·Filed 1979·Granted Feb 17, 1981·36 cites·12 claims
- 1693US4092067APrinting methodGRETAG AG·Filed 1976·Granted May 30, 1978·28 cites·20 claims
- 1790US4150894AExposure control system for color printersGRETAG AG·Filed 1978·Granted Apr 24, 1979·21 cites·7 claims
- 1887US4145569AMethod and apparatus for synchronizing the ciphering and deciphering of binary-coded messagesGRETAG AG·Filed 1964·Granted Mar 20, 1979·28 cites·27 claims
- 1987US4131879AMethod and apparatus for determining the relative positions of corresponding points or zones of a sample and an orginalGRETAG AG·Filed 1977·Granted Dec 26, 1978·39 cites·30 claims
- 2086US4432637AApparatus for the preparation of sections of photographic film for passage through a continuous printer, particularly for processing of photographic print reordersGRETAG AG·Filed 1982·Granted Feb 21, 1984·35 cites·8 claims
- 2186US4279505AMethod for print exposure controlGRETAG AG·Filed 1979·Granted Jul 21, 1981·18 cites·22 claims
- 2286US3959592AMethod and apparatus for transmitting and receiving electrical speech signals transmitted in ciphered or coded formGRETAG AG·Filed 1973·Granted May 25, 1976·34 cites·35 claims
- 2384US5206707AApparatus for the analysis of print control fieldsGRETAG AG·Filed 1991·Granted Apr 27, 1993·25 cites·22 claims
- 2484US4111379ACassette for strip materialGRETAG AG·Filed 1977·Granted Sep 5, 1978·16 cites·15 claims
- 2583US4675500ALaser processing apparatus with means for selectively varying the transverse mode distribution of the laser beamGRETAG AG·Filed 1984·Granted Jun 23, 1987·45 cites·12 claims
- 2680US4713537AMethod and apparatus for the fine position adjustment of a laser beamGRETAG AG·Filed 1986·Granted Dec 15, 1987·42 cites·23 claims
- 2780US4371258AIlluminating device for photographic copying apparatusGRETAG AG·Filed 1981·Granted Feb 1, 1983·16 cites·17 claims
- 2879US5267178APhotometric process and computer controlled photometerGRETAG AG·Filed 1992·Granted Nov 30, 1993·52 cites·16 claims
- 2979US4369434AEnciphering/deciphering systemGRETAG AG·Filed 1980·Granted Jan 18, 1983·46 cites·5 claims
- 3077US4969188AProcess and apparatus for the protection of secret elements in a network of encrypting devices with open key managementGRETAG AG·Filed 1988·Granted Nov 6, 1990·69 cites·17 claims
- 3176US4151373AData transmission systemGRETAG AG·Filed 1977·Granted Apr 24, 1979·26 cites·10 claims
- 3275US4741439ACassette for photographic strip materialGRETAG AG·Filed 1986·Granted May 3, 1988·21 cites·14 claims
- 3375US3950093AMethod and apparatus for printing coloured originalsGRETAG AG·Filed 1974·Granted Apr 13, 1976·10 cites·13 claims
- 3474US4961646AManual device for the detection of optical reflection propertiesGRETAG AG·Filed 1989·Granted Oct 9, 1990·33 cites·26 claims
- 3571US4068094AMethod and apparatus for the scrambled transmission of spoken information via a telephony channelGRETAG AG·Filed 1976·Granted Jan 10, 1978·24 cites·32 claims
- 3670US4618982ADigital speech processing system having reduced encoding bit requirementsGRETAG AG·Filed 1982·Granted Oct 21, 1986·45 cites·15 claims
- 3766US4212419AStrip guiding deviceGRETAG AG·Filed 1978·Granted Jul 15, 1980·13 cites·3 claims
- 3866US4139779AMethod of assessing a printed articleGRETAG AG·Filed 1977·Granted Feb 13, 1979·15 cites·19 claims
- 3966US4078858AMeasuring headGRETAG AG·Filed 1976·Granted Mar 14, 1978·19 cites·11 claims
- 4065US4567362AProcess and apparatus for the focusing of a beam of light on an objectGRETAG AG·Filed 1983·Granted Jan 28, 1986·16 cites·42 claims
- 4163US4143279AMethod and apparatus for testing the print quality of printed texts, more particularly banknotesGRETAG AG·Filed 1977·Granted Mar 6, 1979·14 cites·31 claims
- 4262US4589131AVoiced/unvoiced decision using sequential decisionsGRETAG AG·Filed 1982·Granted May 13, 1986·33 cites·33 claims
- 4362US4313031AEncipher-decipher device having semi-automatic generation of the code key during data entryGRETAG AG·Filed 1979·Granted Jan 26, 1982·16 cites·14 claims
- 4460USD264444SDensitymeterGRETAG AG·Filed 1980·Granted May 18, 1982·11 cites·1 claims
- 4560US4303832AProcess for assessing the quality of a printed productGRETAG AG·Filed 1979·Granted Dec 1, 1981·10 cites·12 claims
- 4660US4222661AProcess and apparatus for printing transparenciesGRETAG AG·Filed 1978·Granted Sep 16, 1980·7 cites·13 claims
- 4759US4441095ACode translatorGRETAG AG·Filed 1978·Granted Apr 3, 1984·15 cites·14 claims
- 4859US4188506AMethod and installation for masked speech transmission over a telephone channelGRETAG AG·Filed 1976·Granted Feb 12, 1980·15 cites·26 claims
- 4957US4552285AUnloading deviceGRETAG AG·Filed 1984·Granted Nov 12, 1985·6 cites·4 claims
- 5056US5519210AApparatus and a process for recording photometric data that is positioned in succession or in adjacent fashion on a page-like or strip-like printGRETAG AG·Filed 1994·Granted May 21, 1996·19 cites·36 claims
Showing the top 50 of 85 patent records by PatentIndex Score.
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