Improved extrusion track for blinds
CA 2198413 C · Owner: Chou, Tser-Wen · Inventors: Chou, Tser-Wen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The improved system utilizes a track (51 ) which has a bowed internal surface to prevent the wheel of the carrier (17) from frictional engagement with the side of the track (51). The curved surface (55) which faces the wheels (27) will not be engaged by the wheels (27) even where the carrier (17) turns to one side or the other. This is accomplished while leaving the innermost portions of the raceway (53) in the same width position with regard to the wheels (27) as is usual to prevent the carrier (17) from coming off-track. The tolerances for the inner corners of the raceway (53) opposing the wheels (27) may be reduced to further prevent the possibility of jamming in the track (51).
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 February 25, 1997 and granted December 28, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 25, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 25, 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.