Assignee
DIGITAL PRODUCTS CORP
14 granted patents·751 citations·filing 1977–1990
Top patents by PatentIndex Score
14 records- 0196US4678994AMethods and apparatus employing apparent resonant properties of thin conducting materialsDIGITAL PRODUCTS CORP·Filed 1984·Granted Jul 7, 1987·97 cites·62 claims
- 0292US4160125ATelephone polling apparatusDIGITAL PRODUCTS CORP·Filed 1977·Granted Jul 3, 1979·62 cites·8 claims
- 0391US4356348ATechniques for detecting a condition of response on a telephone lineDIGITAL PRODUCTS CORP·Filed 1979·Granted Oct 26, 1982·41 cites·42 claims
- 0490US4924211APersonnel monitoring systemDIGITAL PRODUCTS CORP·Filed 1988·Granted May 8, 1990·97 cites·22 claims
- 0581US5075670APersonnel monitoring tag with tamper detection and secure resetDIGITAL PRODUCTS CORP·Filed 1990·Granted Dec 24, 1991·79 cites·19 claims
- 0678US4438296AMultimessage automatic telephone polling methods and apparatusDIGITAL PRODUCTS CORP·Filed 1980·Granted Mar 20, 1984·34 cites·33 claims
- 0777US4201896ATelephone polling apparatus using a plurality of timers to detect the line conditionsDIGITAL PRODUCTS CORP·Filed 1978·Granted May 6, 1980·18 cites·2 claims
- 0876US4569522AGaming device using visible randomizationDIGITAL PRODUCTS CORP·Filed 1982·Granted Feb 11, 1986·27 cites·17 claims
- 0970US4747120AAutomatic personnel monitoring systemDIGITAL PRODUCTS CORP·Filed 1985·Granted May 24, 1988·110 cites·57 claims
- 1068US5032823ASecure personnel monitoring systemDIGITAL PRODUCTS CORP·Filed 1990·Granted Jul 16, 1991·116 cites·22 claims
- 1160US4696385AElectronic coin detection apparatusDIGITAL PRODUCTS CORP·Filed 1984·Granted Sep 29, 1987·22 cites·12 claims
- 1257US4188510ATelephone sequential number dialer with number incrementingDIGITAL PRODUCTS CORP·Filed 1978·Granted Feb 12, 1980·8 cites·5 claims
- 1342US5103474ADrive-by personnel monitoring system with radio linkDIGITAL PRODUCTS CORP·Filed 1990·Granted Apr 7, 1992·36 cites·17 claims
- 1431US4533141AGaming apparatus with color sensitive detectorDIGITAL PRODUCTS CORP·Filed 1982·Granted Aug 6, 1985·4 cites·7 claims
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