Assignee
TELEFONBAU & NORMALZEIT GMBH
22 granted patents·541 citations·filing 1974–1995
Top patents by PatentIndex Score
22 records- 0195US4995071AVideo conference installationTELEFONBAU & NORMALZEIT GMBH·Filed 1989·Granted Feb 19, 1991·231 cites·21 claims
- 0275US5006920AElectrical componentsTELEFONBAU & NORMALZEIT GMBH·Filed 1988·Granted Apr 9, 1991·42 cites·9 claims
- 0368US4782522ATerminal for a telecommunications switching system having an additional keyboard and/or visual displayTELEFONBAU & NORMALZEIT GMBH·Filed 1987·Granted Nov 1, 1988·31 cites·9 claims
- 0468US4503413ASpool for transformer in power supply deviceTELEFONBAU & NORMALZEIT GMBH·Filed 1982·Granted Mar 5, 1985·23 cites·4 claims
- 0567US5012348ATerminal device for picture communicationTELEFONBAU & NORMALZEIT GMBH·Filed 1990·Granted Apr 30, 1991·35 cites·8 claims
- 0664US4790007ATelephone instrumentTELEFONBAU & NORMALZEIT GMBH·Filed 1987·Granted Dec 6, 1988·32 cites·9 claims
- 0758US4991167AVoice controlled attenuation adjustment in telephone transmission circuitsTELEFONBAU & NORMALZEIT GMBH·Filed 1989·Granted Feb 5, 1991·30 cites·2 claims
- 0850US4245339ATelecommunication switching network having a multistage reversed trunking schemeTELEFONBAU & NORMALZEIT GMBH·Filed 1979·Granted Jan 13, 1981·7 cites·7 claims
- 0945US5661784AMethod for operating an automatic ordering system in communication switching exchangesTELEFONBAU & NORMALZEIT GMBH·Filed 1995·Granted Aug 26, 1997·28 cites·12 claims
- 1040USD347007STelephone setTELEFONBAU & NORMALZEIT GMBH·Filed 1992·Granted May 17, 1994·3 cites·1 claims
- 1140USD346800STelephone setTELEFONBAU & NORMALZEIT GMBH·Filed 1992·Granted May 10, 1994·3 cites·1 claims
- 1240US3996424AElectronic telephone systemsTELEFONBAU & NORMALZEIT GMBH·Filed 1974·Granted Dec 7, 1976·6 cites·3 claims
- 1339US5289538ACircuit arrangement for signal and information conversion between analog junction lines and digital terminal devices in communications exchangesTELEFONBAU & NORMALZEIT GMBH·Filed 1991·Granted Feb 22, 1994·16 cites·5 claims
- 1438US5179587ADigital telecommunications exchange systemTELEFONBAU & NORMALZEIT GMBH·Filed 1990·Granted Jan 12, 1993·19 cites·19 claims
- 1538US4813880AArrangement for main distribution framesTELEFONBAU & NORMALZEIT GMBH·Filed 1987·Granted Mar 21, 1989·7 cites·13 claims
- 1638US4813072ASwitching device for power supply to additional accessories for a telephoneTELEFONBAU & NORMALZEIT GMBH·Filed 1987·Granted Mar 14, 1989·7 cites·4 claims
- 1737USD347632STelephone setTELEFONBAU & NORMALZEIT GMBH·Filed 1992·Granted Jun 7, 1994·2 cites·1 claims
- 1837US4533793AWall exchangeTELEFONBAU & NORMALZEIT GMBH·Filed 1982·Granted Aug 6, 1985·8 cites·6 claims
- 1935US4937858ATelephone handset with electro-acoustic converters electrically connected by a cordTELEFONBAU & NORMALZEIT GMBH·Filed 1988·Granted Jun 26, 1990·5 cites·8 claims
- 2034USD346799STelephone setTELEFONBAU & NORMALZEIT GMBH·Filed 1992·Granted May 10, 1994·1 cites·1 claims
- 2134US4326108AHook switch for telephone instrumentsTELEFONBAU & NORMALZEIT GMBH·Filed 1980·Granted Apr 20, 1982·4 cites·13 claims
- 2220US3963878ASignal interpreting system for frequency selective multifrequency tone dialingTELEFONBAU & NORMALZEIT GMBH·Filed 1974·Granted Jun 15, 1976·1 cites·3 claims
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