Screw with filler-receiving head
CA 1237304 A · Owner: Visinand, Jean-Claude · Inventors: Visinand, Jean-Claude
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is concerned with a screw-type fastener having a threaded shank and a head integral therewith and adapted to be driven into a structure by axial rotation about its longitudinal central axis in a driving direction such that the head is countersunk. The head has a circular peripheral edge and is formed with at least two ribs of substantially rectangular cross-section protruding from the surface of the head thereof and extending radially outward from the central axis to terminate flush with the peripheral edge while maintaining the cross-section constant. The ribs define a corresponding number of sector-shaped cavities adapted to receive a filler material for engaging the ribs so …
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 May 31, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 31, 2005.
- 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.