Company Filing History:
4 out of 4,171 
3 out of 2,276 
1 out of 1 Years Active: 1993-2000
Title: David Jeffrey Westergaard: Innovator in Telecommunications
Introduction
David Jeffrey Westergaard is a notable inventor based in Calgary, Canada. He has made significant contributions to the field of telecommunications, holding a total of 8 patents. His work focuses on enhancing communication systems, particularly in the area of multi-line key telephone systems.
Latest Patents
One of Westergaard's latest patents is for a key telephone system without common control. This innovative system allows for a multi-line key telephone setup that does not require a key service unit. It includes three analog telephone lines, to which up to eight three-line telephones can be connected. This design provides enhanced service features while maintaining cost-effectiveness. The system ensures reliability, even during power outages, by incorporating POTS telephones to deliver uninterrupted essential telephone service. Data and voice communications are facilitated by converting an input digital bit stream into an out-of-band binary FSK radio frequency output signal. This signal is communicated between the three-line telephones as data packets within a TDM frame, allowing analog voice communications to proceed without interference. The initiating telephone acts as a master station, while the called telephone functions as a slave station, ensuring synchronized communications.
Career Highlights
Westergaard has had a distinguished career, working with prominent companies such as Nortel Networks Corporation and Northern Telecom Limited. His experience in these organizations has contributed to his expertise in telecommunications and innovation.
Collaborations
Throughout his career, Westergaard has collaborated with notable individuals, including Robert Barrie Turnbull and Alan D Eyre. These partnerships have likely enriched his work and contributed to his success as an inventor.
Conclusion
David Jeffrey Westergaard's contributions to telecommunications through his innovative patents and career achievements highlight his role as a significant figure in the field. His work continues to influence communication systems today.