Fastening screw and method of forming same
CA 2254205 C · Owner: W.A. Deutsher Pty Ltd · Inventors: Roberts, David James Alexander
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fastening screw having an elongate shank (1) and a drilling tip (2) and a head (3), provided at respective opposite ends of the shank (1). The drilling tip (2) has a cutting edge (5) for cutting through metal and a flute (6) extending longitudinally of the shank (1). A thread (8) is formed on the shank (1 ) and extends over a portion of the section of the shank (1) in which the flute (6) is formed. A method of forming a fastening screw from a screw preform (9), includes deforming the preform (9) to create a drilling tip (2) which has at least one cutting edge (5) and a flute (6) and applying a thread (8), to the shank (1) in the region in which the flute (6) is formed.
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 November 17, 1998 and granted January 21, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 17, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 17, 2020.
- 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.