Toothed fastener
CA 2114549 A1 · Owner: Matthews, Norman Leslie · Inventors: Matthews, Norman Leslie
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A toothed fastener having a threaded portion and a, head portion provided integral to the threaded portion the, head portion having a toothed outer periphery and a pressure transmitting surface. The fastener also has a friction reducing means comprising a first part having a first pressure transmitting surface and a second part having second and third pressure transmitting surfaces. The second part is located between the head portion of the fastener and the first part. A solid dry lubricant material in the form of an annulus is located between the first and second parts to reduce friction therebetween, whereby the first part can be held stationary relative to the object to be fastened 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
- Filed July 29, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 29, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 29, 2014.
- 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.