Optical time domain reflectometer
CA 2070428 C · Owner: Qinetiq Limited · Inventors: Lewis, Meirion Francis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical time domain reflectometer, incorporates a pulse expander (16) arranged o frequency disperse short duration pulses (14) from a pulse generator (12). The pulse expander (16) is a surface acoustic wave (SAW) filter. The frequency dispersed pulses (18) have long duration, and when amplified are employed to modulate the optical output of a laser diode (24). The optical output is fed to an optical fibre (32) for conventional time domain reflectometry measurements, and return signals are detected conventionally. The detected signals are transformed to short pulses (52) by a second SAW filter arranged as a pulse compressor (36).
Read the whole patent
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 December 21, 1990 and granted October 30, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 21, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 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.
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.