Inventor · disambiguated record
Charles David Caldwell
Also filed as: CALDWELL CHARLES D · CALDWELL CHARLES DAVID
11 granted patents·1 pending application·704 citations·filing 1994–2016
91Inventor score
Top patents by PatentIndex Score
12 records- 0197US5671267AInteractive system for communications between a cordless telephone and a remotely operated deviceLUCENT TECHNOLOGIES INC·Filed 1994·Granted Sep 23, 1997·453 cites·23 claims
- 0289US6021432ASystem for processing broadcast stream comprises a human-perceptible broadcast program embedded with a plurality of human-imperceptible sets of informationLUCENT TECHNOLOGIES INC·Filed 1997·Granted Feb 1, 2000·171 cites·29 claims
- 0380US7027986B2Method and device for providing speech-to-text encoding and telephony serviceAT & T CORP·Filed 2002·Granted Apr 11, 2006·24 cites·6 claims
- 0476US7627529B1Method and system for allowing simultaneous usage of prepaid servicesAT & T CORP·Filed 2003·Granted Dec 1, 2009·12 cites·30 claims
- 0574US8265931B2Method and device for providing speech-to-text encoding and telephony serviceCALDWELL CHARLES DAVID·Filed 2008·Granted Sep 11, 2012·4 cites·14 claims
- 0668US7433818B2Subscriber terminal for providing speech-text encoding and telephony serviceAT & T CORP·Filed 2006·Granted Oct 7, 2008·2 cites·9 claims
- 0765US8019686B1Method and system for allowing simultaneous usage of prepaid servicesAT & T IP II LP·Filed 2009·Granted Sep 13, 2011·0 cites·19 claims
- 0863US6418202B1Spontaneous messaging service for prepaid calling card usersAT & T CORP·Filed 1998·Granted Jul 9, 2002·37 cites·8 claims
- 0957US9361888B2Method and device for providing speech-to-text encoding and telephony serviceAT & T IP II LP·Filed 2013·Granted Jun 7, 2016·0 cites·20 claims
- 1054US6687349B1System and method for defining a local communication spaceAT & T CORP·Filed 2001·Granted Feb 3, 2004·1 cites·17 claims
- 1153US8489397B2Method and device for providing speech-to-text encoding and telephony serviceCALDWELL CHARLES DAVID·Filed 2012·Granted Jul 16, 2013·0 cites·20 claims
- 1249US2016284352A1Method and device for providing speech-to-text encoding and telephony serviceAT & T IP II LP·Filed 2016·Application pending·0 cites
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