Open joist
CA 2008043 C · Owner: Open Joist 2000 Inc. · Inventors: Lemyre, Rene Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a wooden joist having upper and lower essentially parallel longitudinal chords and a plurality of interconnecting struts in zig-zag arrangement each strut, being terminally joined to a respective chord and to an adjacent strut near this chord by finger scarfing. In accordance with the invention, it has been found that the strength of the joints of this joist can be increased by ensuring that (a) the teeth of triangular section obtained by finger scarfing have an apical angle in the range from 8° to 10° (b) this triangular section has a perpendicular height in the range from 7/16 to 9/16 inch; and (c) the end of each tooth is truncated to form an apical butt and this apical butt …
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 January 18, 1990 and granted December 28, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 18, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 18, 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.