Wood screw
CA 1253018 A · Owner: Sahlin, Anders · Inventors: Sahlin, Mats; Sahlin, Anders
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A wood screw is characterized in that its core is generally cylindrical with a diameter which does not exceed that of a prebored hole, that it comprises two threads, viz. a main thread and an auxiliary thread of, which the former protrudes considerably more from the circumference of the core than the latter and both of which are formed as sharp threads, i.e. are thin in relation to their depth, and that the front end of the cylindrical core is provided with a recess having an edge acting as a cutter.
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
- Granted April 25, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 25, 2006.
- 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.