Assignee
NORTHERN ILLINOIS GAS CO
US·13 granted patents·844 citations·filing 1974–1994
Top patents by PatentIndex Score
13 records- 0196US3967202AData transmission system including an RF transponder for generating a broad spectrum of intelligence bearing sidebandsNORTHERN ILLINOIS GAS CO·Filed 1974·Granted Jun 29, 1976·289 cites·22 claims
- 0294US4081748AFrequency/space diversity data transmission systemNORTHERN ILLINOIS GAS CO·Filed 1976·Granted Mar 28, 1978·142 cites·13 claims
- 0392US4031513ARF data exchange systemNORTHERN ILLINOIS GAS CO·Filed 1974·Granted Jun 21, 1977·84 cites·12 claims
- 0486US4040046ARemote data readout system for transmitting digital data over existing electrical power linesNORTHERN ILLINOIS GAS CO·Filed 1975·Granted Aug 2, 1977·47 cites·6 claims
- 0583US5381136ARemote data collection and monitoring system for distribution lineNORTHERN ILLINOIS GAS CO·Filed 1993·Granted Jan 10, 1995·131 cites·13 claims
- 0681US4839642AData transmission system with data verificationNORTHERN ILLINOIS GAS CO·Filed 1987·Granted Jun 13, 1989·68 cites·5 claims
- 0762US5542287APortable gas pressure monitor with independently adjustable high and low set pointsNORTHERN ILLINOIS GAS CO·Filed 1994·Granted Aug 6, 1996·27 cites·1 claims
- 0857US4634859AOptical encoder with two photosensorsNORTHERN ILLINOIS GAS CO·Filed 1984·Granted Jan 6, 1987·11 cites·17 claims
- 0946US4366486ALow profile antenna for data transpondersNORTHERN ILLINOIS GAS CO·Filed 1981·Granted Dec 28, 1982·10 cites·11 claims
- 1045US5460071APower driven casing splitter apparatusNORTHERN ILLINOIS GAS CO·Filed 1993·Granted Oct 24, 1995·14 cites·4 claims
- 1135US4616193AHigh frequency transistor oscillator with discrete resonator elements for transponderNORTHERN ILLINOIS GAS CO·Filed 1985·Granted Oct 7, 1986·5 cites·16 claims
- 1232US5365977APipe sealNORTHERN ILLINOIS GAS CO·Filed 1993·Granted Nov 22, 1994·9 cites·15 claims
- 1331US5297584APipe sealNORTHERN ILLINOIS GAS CO·Filed 1992·Granted Mar 29, 1994·7 cites·10 claims
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