Company Filing History:
2 out of 745 
2 out of 3,345 
Years Active: 1986-1988
Title: Douglas S Sand: Innovator in Telecommunication Systems
Introduction
Douglas S Sand is a notable inventor based in Naperville, IL (US), recognized for his contributions to telecommunication systems. He holds a total of 4 patents, showcasing his expertise in distributed control and switching technologies.
Latest Patents
One of his latest patents is titled "Architecture for distributed control telecommunication systems." This invention involves a distributed processing telecommunication switching system that comprises multiple switching modules. Each module independently manages telephone call control processing actions, including the selection of available ports in a multiport hunt group, without needing a central processor. The modules are equipped with processors, customer line ports, interoffice trunk connections, and a switching network for interconnecting ports and outlets. The processors communicate through a high-speed common data communication facility, facilitating intermodule call control messages and port availability data.
Another significant patent is "Controlling multi-port hunt groups in a distributed control switching." This system allows control units to cooperatively determine terminating ports. Multi-port hunt groups, which span several switching modules, are efficiently managed by designating one module as the group controller. This controller maintains dynamic busy/idle data for the group and performs the hunting function to assign idle members to incoming calls.
Career Highlights
Douglas has had a distinguished career, working with prominent companies such as American Telephone & Telegraph Co. and AT&T Bell Laboratories. His experience in these organizations has significantly influenced his innovative work in telecommunication technologies.
Collaborations
Throughout his career, Douglas has collaborated with notable individuals, including Menachem T Ardon and James C Kennedy. These partnerships have contributed to the advancement of his projects and patents.
Conclusion
Douglas S Sand's innovative work in telecommunication systems has made a lasting impact on the industry. His patents reflect a deep understanding of distributed control technologies, showcasing his role as a key inventor in this field.