Improvements in and relating to building blocks
CA 2250992 A1 · Owner: Clark, Michael David · Inventors: Clark, Lynda Susan; Clark, Michael David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A building block (20) of chevron shaped uniform transverse section with a hollow core (33). A dovetail nib (26) and complimentary recess (32) are respectively located centrally about the apexes (29 and 30) of the inverted Vshaped upper and lower surfaces (25 and 31). The recess (32) opens into the hollow core (33). By sliding the nib (26) of one block within the recess (32) of a like block stable wall structures can be formed without the need for mortar. Such structures can be provided with additional mass by filling the internal voids formed between adjoining blocks with granular material as construction proceeds. Blocks with sides (23 and 24) of equal height build into planar …
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 April 10, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 10, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 10, 2019.
- 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.