Shoe having an inflatable bladder
CA 2490408 C · Owner: Marvin, William · Inventors: Davis, Paul M.; Litchfield, Paul E.; Swales, Geoff
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An article of footwear including a sole and an upper with an exterior and interior surface, and one or more bladders (1430) which comprises at least one of the exterior or interior surfaces of the upper. The bladder (1430) comprising sheets of polyurethane or polyester film attached together to form an airtight seal. The article of footwear also includes a inflation mechanism (1460) for selectively introducing air in the one or more bladders (1430). The inflation mechanism (1460) is located under the foot of the wearer to be activated by the normal action of the wearer to inflate the one or more bladders (1430). The article of footwear may also include an assembly for connecting …
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 2, 2003 and granted March 13, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 2, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 2, 2025.
- 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.