Easy drive concrete fastener system
CA 2194104 C · Owner: Ditka, Michael P. · Inventors: Reinhard, Larry; Ditka, Michael P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A depth-insensitive concrete fastener system is provided for securing roofing insulation materials to concrete roofing or decking. The concrete roofing or decking substructure is provided with a pre-drilled hole or bore having a predetermined diametrical extent. An anchor bolt fastener comprises a head portion a pointed tip portion and a shank portion interconnecting the head and tip portions. The shank portion has a first relatively smooth shank portion disposed adjacent to the head portion and extending toward the tip portion and a second ribbed portion disposed adjacent to the tip portion and having an axial extent which is only a fractional portion of the entire axial extent of the …
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 December 30, 1996 and granted June 15, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 30, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 30, 2018.
- 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.