Canopy frame for umbrella of various shapes
CA 2307519 C · Owner: Tsai, Chin-Fu · Inventors: Tsai, Chin-Fu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A canopy frame for umbrella has a structure adapted for various shapes making , the, appearance of umbrellas dexterous and interesting. The frame has a main shaft an, upper sliding notch, a lower sliding notch multiple positioning ribs, multiple upper spreaders, upright ribs, upper angle-forming clamps auxiliary stretchers, lower spreaders, and multiple clamping pieces. Two positioning holes are on the main shaft for the, fixing of the upper and lower sliding notch and at the top end of the main shaft is, disposed the fixed notch. The upper and lower sliding notch mounted consecutively on, the main shaft under the fixed notch. One end of each positioning rib is connected to, the fixed …
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 May 4, 2000 and granted October 7, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 4, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 4, 2022.
- 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.