An inexpensive single-fiber bidirectional data link
CA 2222845 C · Owner: Norte, David A. · Inventors: Norte, David A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical wavelength-division multiplexed bidirectional data link (FIG. 1) is constructed using a single multi-mode fiber (130). The link comprises the optical fiber with a single-lens optical transceiver (100 150) at each end of the fiber. Each single-lens optical transceiver comprises a transmitter in the form of a surface-emitting light-emitting diode (LED 101) that emits light at a wavelength of .85µm and a receiver in the form of a large-scale optical detector (102) and a dielectric optical filter (103) that has a passband at a wavelength of 1.3µm. In the other transceiver, the wavelengths of the transmitter and the receiver are reversed. The transceiver is made as a single …
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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 November 28, 1997 and granted November 27, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 28, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 28, 2019.
- 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.