Two-wire power and position control system
CA 2018733 C · Owner: Ho, Kwok-Chuen · Inventors: Vepy, Tamas A.; Ho, Kwok-Chuen; Tong, Chi-Shing
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A two-wire power and position control system uses a pair of electrical conductors between a central station and remote station. The remote station is arranged to generate a physical displacement by a permanent magnet DC motor and attached gear-linkage mechanism. Pulsating voltage is applied to the two-wire connecting link from the central station to the remote station as the power source for the DC motor. The physical displacement information of the remote station is extracted by the central station within the off-cycles of the pulsating power signal. In the first arrangement. the remote station enables or disables the flow of back-EMF signal generated by the permanent magnet DC motor as a …
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 June 11, 1990 and granted April 25, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 11, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 11, 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.