Method for making building elements
CA 2441825 C · Owner: Gaillard, Jean-Marie · Inventors: Gaillard, Jean-Marie; Serras, Edouard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a method for making a building element based on gypsum plaster which consists in introducing a mixture of gypsum plaster granular filler and water in a mould (10) with rigid and shape-retaining walls (12 14, 16), compressing said mixture in the mould at a pressure not less than a threshold value as from which the gypsum plaster is prevented from being crystallised by increasing its water-solubility then in causing it to be rapidly crystallised by decreasing or stopping the compression of the mixture.
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 March 7, 2002 and granted November 22, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 7, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 7, 2024.
- 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.