Studded footwear
CA 2067344 C · Owner: Trisport Limited · Inventors: Collins, David Roy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
It has previously been thought desirable when providing an internally screwthreaded socket (1) for use in studded foot-wear to provide each socket and a complementary stud (2) with complementary screw-threads with a small helix angle and many turns in order to maximise the frictional grip between the stud (2) and socket (1). The invention provides a multi-start thread requiring at most one and a half turns (560°) to achieve full engagement, Contrary to conventional thinking such an arrangement is workable and has advantages over the known single start-threads for studded footwear. Arrangements of sockets and studs with two-start threads and retaining means (14; 16; 17 and 19) to …
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 October 4, 1990 and granted September 12, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 4, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 4, 2012.
- 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.