Over-center hollow wall anchor with enhanced holding strength
CA 2064556 C · Owner: Mcsherry, Thomas W. · Inventors: Garfield, Nathaniel H.; Mcsherry, Thomas W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A plastic over-center hollow wall anchor (10) having increased strength without increase in thickness of load bearing members (12a-b) and necessitation of a larger insertion aperture. The bending motion stress on the load bearing arms (12a-b) which causes the, weakening or failure mode of the anchor (10) is substantially retarded by the inclusion of a small reinforcing boss (34a-b) across the bending area (300a).
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 February 25, 1991 and granted December 13, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 25, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 25, 2013.
- 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.