Gripping plate for attaching roofing membrane
CA 2208918 C · Owner: Illinois Tool Works Inc. · Inventors: Larson, Paul M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A gripping element for attaching a roofing membrane to a roof includes a generally planar plate having a generally central opening and an oblong peripheral edge. The plate includes a top surface facing away from the roofing membrane an upwardly, projecting rib, and a plurality of gripping formations for preventing slippage of the roofing membrane relative to the plate. Preferably the central opening is larger in diameter than the diameter of a corresponding threaded fastener so that the plate is permitted a specified amount of rocking when subjected to a membrane uplift force.
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 June 27, 1997 and granted December 25, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 27, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 27, 2019.
- 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.