Early-rain-resistant jointing compounds
CA 2069934 C · Owner: Podola, Tore · Inventors: Loth, Helmut; Helpenstein, Klaus; Knop, Bernhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A s t r a c t, The invention relates to early-rain-resistant jointing compounds containing, - aqueous polymer dispersions (I) - nonionic cellulose ethers (II) from the group consisting of hydroxyethyl, hydroxyethyl methyl hydroxyprop-, yl methyl and hydroxypropyl cellulose - fillers and, - optionally typical additives such as pigments, plasticizers, extenders thickeners, foam inhibitors, dispersion aids pH regulators, preservatives and, antiagers which can be produced by thorough mixing of (I) with the other constituents. To be able to introduce (II) in quantities above the solubility limit, the jointing compounds are characterized in that (II) is added and intermixed in retarded form in …
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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 October 10, 1990 and granted September 13, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 10, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 10, 2012.
- 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.