Assignee
NAT COMPUTER SYSTEMS INC
US·32 granted patents·2,269 citations·filing 1972–1995
Top patents by PatentIndex Score
32 records- 0195US5466159ACollaborative and quality control scoring systemNAT COMPUTER SYSTEMS INC·Filed 1994·Granted Nov 14, 1995·109 cites·12 claims
- 0295US5437554ASystem for providing performance feedback to test resolversNAT COMPUTER SYSTEMS INC·Filed 1993·Granted Aug 1, 1995·109 cites·24 claims
- 0394US5558521ASystem for preventing bias in test answer scoringNAT COMPUTER SYSTEMS INC·Filed 1994·Granted Sep 24, 1996·92 cites·14 claims
- 0493US5458493ADynamic on-line scoring guideNAT COMPUTER SYSTEMS INC·Filed 1994·Granted Oct 17, 1995·83 cites·2 claims
- 0591US5718591AMethod for providing performance feedback to test resolversNAT COMPUTER SYSTEMS INC·Filed 1995·Granted Feb 17, 1998·64 cites·24 claims
- 0691US5716213AMethod for preventing bias in test answer scoringNAT COMPUTER SYSTEMS INC·Filed 1995·Granted Feb 10, 1998·88 cites·14 claims
- 0790US5752836ACategorized test item reporting methodNAT COMPUTER SYSTEMS INC·Filed 1995·Granted May 19, 1998·79 cites·7 claims
- 0890US5735694ACollaborative and quality control scoring methodNAT COMPUTER SYSTEMS INC·Filed 1995·Granted Apr 7, 1998·83 cites·12 claims
- 0990US4937439AMethod and system for creating and scanning a customized survey formNAT COMPUTER SYSTEMS INC·Filed 1988·Granted Jun 26, 1990·192 cites·13 claims
- 1089US5690497ADynamic on-line scoring methodNAT COMPUTER SYSTEMS INC·Filed 1995·Granted Nov 25, 1997·79 cites·2 claims
- 1189US5262943ASystem and process for information management and reportingNAT COMPUTER SYSTEMS INC·Filed 1991·Granted Nov 16, 1993·230 cites·56 claims
- 1289US5103490AMethod and apparatus for storing and merging multiple optically scanned imagesNAT COMPUTER SYSTEMS INC·Filed 1990·Granted Apr 7, 1992·183 cites·23 claims
- 1389US5086215AMethod and apparatus for discriminating or locating bar codes for an optical mark readerNAT COMPUTER SYSTEMS INC·Filed 1988·Granted Feb 4, 1992·122 cites·7 claims
- 1488US5709551AMultiple test item scoring methodNAT COMPUTER SYSTEMS INC·Filed 1995·Granted Jan 20, 1998·73 cites·5 claims
- 1587US5433615ACategorized test item reporting systemNAT COMPUTER SYSTEMS INC·Filed 1993·Granted Jul 18, 1995·104 cites·7 claims
- 1687US5321611AMultiple test scoring systemNAT COMPUTER SYSTEMS INC·Filed 1993·Granted Jun 14, 1994·103 cites·5 claims
- 1785US5001330AOptically scanned document with fail-safe markingNAT COMPUTER SYSTEMS INC·Filed 1988·Granted Mar 19, 1991·84 cites·8 claims
- 1882US5531429AVariable printing and selective binding of bookletsNAT COMPUTER SYSTEMS INC·Filed 1995·Granted Jul 2, 1996·69 cites·32 claims
- 1981US4164765ACarousel tape systemNAT COMPUTER SYSTEMS INC·Filed 1977·Granted Aug 14, 1979·23 cites·61 claims
- 2079US5184003AScannable form having a control mark column with encoded data marksNAT COMPUTER SYSTEMS INC·Filed 1992·Granted Feb 2, 1993·70 cites·22 claims
- 2178US4857715AOverprint registration system for printing a customized survey form and scannable form thereforNAT COMPUTER SYSTEMS INC·Filed 1988·Granted Aug 15, 1989·55 cites·6 claims
- 2273US4934684ASheet picking mechanismNAT COMPUTER SYSTEMS INC·Filed 1988·Granted Jun 19, 1990·20 cites·15 claims
- 2371US3983364AApparatus utilizing analog-to-digital conversion in the photoelectric reading of documentsNAT COMPUTER SYSTEMS INC·Filed 1972·Granted Sep 28, 1976·28 cites·14 claims
- 2466US4217487ASelf-calibrating apparatus for photoelectrically scanning answer documentsNAT COMPUTER SYSTEMS INC·Filed 1978·Granted Aug 12, 1980·27 cites·18 claims
- 2562US4300791AOptically scannable answer sheet booklet with sequence bars printed thereon and method of producing sameNAT COMPUTER SYSTEMS INC·Filed 1980·Granted Nov 17, 1981·21 cites·6 claims
- 2662US4219736AApparatus for photoelectrically reading a translucent answer document having a bias bar printed thereonNAT COMPUTER SYSTEMS INC·Filed 1975·Granted Aug 26, 1980·13 cites·19 claims
- 2755US5420407AAdjustable read level threshold for optical mark scanningNAT COMPUTER SYSTEMS INC·Filed 1993·Granted May 30, 1995·22 cites·40 claims
- 2855US5195738ASingle sheet picking and transport mechanismNAT COMPUTER SYSTEMS INC·Filed 1991·Granted Mar 23, 1993·12 cites·19 claims
- 2948US5262624AOpposite surface scanning of a mark sense formNAT COMPUTER SYSTEMS INC·Filed 1993·Granted Nov 16, 1993·16 cites·11 claims
- 3038US4127065AEncoding printing deviceNAT COMPUTER SYSTEMS INC·Filed 1976·Granted Nov 28, 1978·5 cites·44 claims
- 3136US4547666AMark array sense reader with sequential output signalsNAT COMPUTER SYSTEMS INC·Filed 1983·Granted Oct 15, 1985·4 cites·5 claims
- 3235US4794241AScannable document velocity detectorNAT COMPUTER SYSTEMS INC·Filed 1988·Granted Dec 27, 1988·7 cites·11 claims
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