Drywall construction method and means therefor
CA 2220743 C · Owner: Fielding, David W. · Inventors: Fielding, David W.; Van Steinburg, Clifford E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A drywall construction simulates a mortared block or brick wall construction by the use of simulated horizontal mortar layer inserts between the layers of building blocks and vertical inserts between abutting end surfaces of blocks in each layer the horizontal layer insert being in the form of a belt the belt, layer being substantially non-compressible and the vertical inserts being provided with parts which extend across the space between abutting block surfaces of a wall construction and into slots provided in the abutting surfaces to secure interconnection and alignment of block ends and simulate vertical mortar inserts between vertical and abutting surfaces the, inserts may be provided …
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 November 19, 1997 and granted October 24, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 19, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 19, 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.