Control system and method for electrically operated equipment
CA 2209725 A1 · Owner: M-I Drilling Fluids L.L.C. · Inventors: Chang, Che-Liang; Martin, Troy; Phillips, Victor
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A system and method for controlling electrical equipment mounted on a platform in a hazardous environment. Control signals are produced by a console at or near the platform that correspond to functions of the equipment. These control signals are passed to control circuitry disposed at a remote location out of the hazardous environment. The control circuitry generates corresponding output signals for controlling the operation of the equipment. Current limiting circuitry is provided between the console and the control circuitry to reduce the current of the control signals to values that will not produce sparks sufficient to ignite flammable fluids such as natural gas.
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 July 7, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 7, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 7, 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.