Screw
CA 2113574 C · Owner: Sfs Industrie Holding Ag · Inventors: Koppel, Norbert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A screw (1) has a shank (2) and a head (3); there are thread sections (7, 10) on the shank with an unthreaded shank section (13) between them. In the unthreaded section (13) there are grooves (14) in order to make said unthreaded section an elastic region. The screw is thus better capable of withstanding transverse forces acting on the head which cause a bending load on the screw.
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 April 20, 1993 and granted January 19, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 20, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 20, 2015.
- 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.