Limit switch for a rolling door
CA 2111839 A1 · Owner: Desrochers, Eddy · Inventors: Desrochers, Eddy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A limit switch for a rolling door assembly includes a disc (60) rotatably mounted for synchronized rotation with a take-up axle (16). The disc (60) has a face having a spiral groove (68) with a length proportional to the length of travel of a rolling door (10) between the open and closed positions. An arm (70) has one end pivotally mounted and has an opposite end frictionally engaging the groove (68) of the disc for pivotal movement between a first position corresponding to the open position of the door and a second position corresponding to the closed position of the door. A first relay (80) is operably connected to the drive and adapted to close when the arm is in the first position …
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 19, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 19, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 19, 2014.
- 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.