Electrically operated folding operable walls
CA 2101376 C · Owner: Cole, Fred · Inventors: Cole, Stephen; Cole, Fred
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Electrically operated folding operable walls are provided that are controlled by an electrical operation circuit of the type having a key switch, a control panel, an extend limit switch a, stack limit switch, control relays and a motor. The invention consists of a mechanism for creating an infrared barrier curtain on opposite sides of an operating path of the folding operable walls. Another mechanism is for shutting down the electrical operation circuit of the folding operable walls when a physical obstruction enters into the operating path of the folding operable walls and interrupts the infrared barrier curtain. Still another mechanism is for restarting up the electrical operation circuit …
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 27, 1993 and granted June 23, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 27, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 27, 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.