INTERNATIONAL TELEPHONE AND TELEGRAPH CORPORATION

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4693551 Dielectric strength elements for loose tube optical fiber cableExpiredOct 05, 83Sep 15, 87[G02B]
4694298 Adaptive, fault-tolerant narrowband filterbankExpiredNov 04, 83Sep 15, 87[G01S]
4677690 Baseband demodulator for FM and/or AM signalsExpiredDec 12, 85Jun 30, 87[H04B]
4653618 Twin tube shock absorber gas sealExpiredFeb 24, 86Mar 31, 87[F16F]
4643519 Wavelength division optical multiplexer/demultiplexerExpiredJun 12, 86Feb 17, 87[G02B]
4641903 Insulation displacement connectorExpiredDec 27, 83Feb 10, 87[H01R]
4633227 Programmable keyboard for a typewriter or similar articleExpiredDec 07, 83Dec 30, 86[G01G]
4628273 Optical amplifierExpiredDec 12, 83Dec 09, 86[H01J, G02B, H01S]
4613198 Electrical connector backshellExpiredNov 04, 83Sep 23, 86[H01R]
D284574 Keyboard or similar articleExpiredNov 30, 83Jul 08, 86[]
4598959 Electrical connector grounding ringExpiredNov 04, 83Jul 08, 86[H01R]
4598975 Multiple fiber linear array and method of making sameExpiredOct 03, 83Jul 08, 86[G02B]
D284379 Video terminalExpiredNov 30, 83Jun 24, 86[]
4591962 Regulated power supply for rapid no-load to full-load transitionsExpiredDec 16, 83May 27, 86[H02M]
4582385 Electrical connector embodying electrical circuit componentsExpiredOct 31, 83Apr 15, 86[H01R]
4577157 Zero IF receiver AM/FM/PM demodulator using sampling techniquesExpiredDec 12, 83Mar 18, 86[H04B, H03D]
4560125 Supporting apparatus for pipelines systemsExpiredNov 14, 83Dec 24, 85[F16L]
4557605 Apparatus for the continuous production of metal alloy compositesExpiredAug 24, 84Dec 10, 85[C22C]
4555154 Electrical connector contact retention assemblyExpiredDec 21, 83Nov 26, 85[H01R]
4555222 Air-operated diaphragm pump and a valve arrangement thereforExpiredDec 23, 83Nov 26, 85[F04B]

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