Building block
CA 2113659 C · Owner: Wagenaar, Jack · Inventors: Wagenaar, Jack
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A building block for dry wall construction has a body with front and rear faces, opposite end faces and top and bottom faces. One end face has a laterally projecting vertically extending rib with an arcuate outer surface and, the other end face has an arcuate recess to receive the rib of a laterally adjacent like vertically extending block in a manner permitting limited relative swivelling movement of two blocks about a vertical axis. One of the top and bottom faces has at least one projection, and the other of the top and bottom faces has a laterally extending groove to receive the at least one projection of a vertically adjacent like block in a manner to permit relative lateral adjustment …
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, 1994 and granted February 2, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 18, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 18, 2016.
- 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.