1
David D Otten: System and method for mobile communications in coexistence with established communications systems. Celsat America, Drummond & Duckworth, April 23, 1996: US05511233 (300 worldwide citation)

A mobile communications system provides communications with mobile users in the interference zones of communications services having priority of use of the frequency band in which the mobile user operates. The frequency band has been previously allocated for use by the other services, such as fixed ...


2
David D Otten: Position determination for reducing unauthorized use of a communication system. Celsat America, Drummond & Duckworth, November 10, 1998: US05835857 (232 worldwide citation)

Methods for operating a wireless communications system provided for reducing the use of the system by unauthorized users by establishing the geographical location of selected user, comparing this location with the known locations of authorized users and denying service to the selected user if the se ...


3
David D Otten: Hybrid satellite communications system. Drummond & Duckworth, February 18, 2003: US06522865 (160 worldwide citation)

A hybrid satellite communications system provides communications, particularly Internet access, to computer users. The hybrid satellite communications system includes a satellite system and a terrestrial communications system. The satellite system includes two transceivers. The first transceiver rec ...


4
David D Otten, David G Duckworth: Data communications systems and methods using different wireless links for inbound and outbound data. ATC Technologies, Myers Bigel Sibley & Sajovec P A, February 6, 2007: US07174127 (108 worldwide citation)

A hybrid satellite communications system provides communications, particularly Internet access, to computer users. The hybrid satellite communications system includes a satellite system and a terrestrial communications system. The satellite system includes two transceivers. The first transceiver rec ...


5
David D Otten, Robert L Sackheim: Spacecraft guidance and control system. TRW, Sol L Goldstein, February 12, 1991: US04991393 (12 worldwide citation)

Apparatus and a corresponding method for controlling the attitude of a space vehicle during operation of its propulsion engines, without gimbaling of the engines. Two engines are differentially throttled, one above and one below a nominal thrust setting of the engines, in response to an error signal ...


6
David D Otten, David G Duckworth: Hybrid satellite communications system. Drummond & Duckworth, East Tower, January 30, 2003: US20030022625-A1 (1 worldwide citation)

A hybrid satellite communications system provides communications, particularly Internet access, to computer users. The hybrid satellite communications system includes a satellite system and a terrestrial communications system. The satellite system includes two transceivers. The first transceiver rec ...


7
David D Otten: System and method for mobile communications in coexistence with established communications systems. Celsat America, GUO XIAOMEI, August 7, 1996: CN95190443

A mobile communications system (10) provides communications with mobile users (22) in the interference zones (32) of communications services having priority of use of the frequency band in which the mobile user operates. The frequency band has been previously allocated for use by the other services, ...


8
David D Otten, David G Duckworth: Internet communications systems and methods using different wireless links for inbound and outbound data. ATC Technologies, Myers Bigel Sibley & Sajovec, June 7, 2007: US20070129019-A1

A hybrid satellite communications system provides communications, particularly Internet access, to computer users. The hybrid satellite communications system includes a satellite system and a terrestrial communications system. The satellite system includes two transceivers. The first transceiver rec ...