Expired Canadian patentCanada
Water-resistant gypsum compositions and emulsion for making same
CA 2116483 C · Owner: Bakor Inc. · Inventors: Borenstein, Lionel
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The water resistance of gypsum compositions such as those used in gypsum wallboard is improved by, incorporating in the compositions an aqueous emulsion containing a paraffinic hydrocarbon having a melting point of 40 to 80°C, montan wax and polyvinyl alcohol.
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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 February 25, 1994 and granted July 22, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 25, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 25, 2016.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledFebruary 25, 1994
GrantedJuly 22, 1997
Term endedFebruary 25, 2014
Patent numberCA 2116483 C
Classification (IPC)C08L91/06 +2 more
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.