Optical communications systems for the subscriber area with optical amplifiers
CA 2061041 C · Owner: Heidemann, Rolf · Inventors: Ohnsorge, Horst; Weygang, Adolf; Heidemann, Rolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Optical communications system for the subscriber area with optical amplifiers. The system according to the invention is used to distribute information signals particularly, telephone signals, from a center to a large number of subscribers and to make possible a bidirectional transmission of telephone and data signals between the center and the subscribers. According to the invention the network used for this purpose is, a multistar fiber-optic network in which fiber-optic amplifiers (10, 11) are present between successive branch points. The information signals to be distributed are transmitted via the fiber-optic network with a first wavelength (.lambda.1) to the subscribers, and the …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed February 11, 1992 and granted April 6, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 11, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 11, 2014.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.