Interlocking block assembly
CA 2044237 A1 · Owner: Trahan, Denis H. · Inventors: Trahan, Denis H.; Trahan, Denis H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A building block made with a top face adapted to be interlocked with the lower edge of a superposed correspondingly made block. The lower edge has an internal pending lip and a downwardly tapering wedge above and adjacent said lip. The top face has a marginal groove for receiving the pending lip of the superposed block and the top face has a ledge partly extending over the groove for gripping the wedge of the superposed block.
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 June 10, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 10, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 10, 2013.
- 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.