Quick-fastening nut
CA 2020851 C · Owner: Hedley Purvis Limited · Inventors: Campbell, David; Walton, John Nigel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A quick-fastening nut for location on an associated bolt comprises a plurality of internally-threaded arcuate, segments each including a part frusto-conical portion and, guide means reacting between the segments whereby the segments can be moved radially towards and away from one another between inoperative positions displaced outwardly of concentricity and operative positions substantially concentric with one another and whereby a frusto-conical surface is presented by the portions. The nut further comprises releasable means for retaining the segments in their operative positions, the arrangement being such that in use, the frusto-conical surface defined by the portions engages a …
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 July 10, 1990 and granted September 7, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 10, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 10, 2012.
- 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.