Portable test receiver for remote monitoring system
CA 2094182 A1 · Owner: Weber, John · Inventors: La Clair, Michael; Cahalan, Irving W.; Weber, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A portable test receiver for field maintenance of a remote sensor monitoring system for underground transformers. The apparatus uses a phase locked loop method to demodulate the DPSK modulation of the remote monitor transmitter. The apparatus is battery operated and easily moved to permit monitoring of spot networks and critical locations for maintenance work. The apparatus features a single software driven display offering good visibility with low current drain. Decoding the transmitter signal is accomplished by using the crystal oscillator circuit of the transmitter is used to generate a reference which is compared to the transmitter signal to detect phase flips. Since the apparatus is …
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 April 16, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 16, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 16, 2015.
- 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.