Optical transmitter power measurement and control
CA 2012116 C · Owner: Woods, James W. · Inventors: Woods, James W.; Nelson, Larry A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fiber optic transmission system including a fiber optic link. Transmitting apparatus transmits an optical signal having a concentration of energy at a particular wavelength. Routing apparatus then routes optical signals in response to the concentration of energy at the particular wavelength of the transmitted optical signal. The routing apparatus is disposed to receive the transmitted optical signal and also reflects a small portion of the transmitted optical signal. A first apparatus for receiving the reflected portion of the optical signal is disposed to cooperate with the routing apparatus and further has apparatus for converting the reflected portion into a control signal. Temperature …
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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 March 14, 1990 and granted May 30, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 14, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 14, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.