Mortarless brick
CA 2257032 C · Owner: Azar, Tony J. · Inventors: Azar, Tony J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A building block is provided for stacking with other like building blocks to fabricate a, wall. The building block has top bottom, front, rear and end surfaces. The front and rear, surfaces are substantially planar. The top surface is ridged and the bottom surface is, channeled to intermit with the ridge on the bottom surface. The ends are notched so as to, overlap.
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 December 24, 1998 and granted December 11, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 24, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 24, 2020.
- 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.