Soluble laminates
CA 2058827 A1 · Owner: Novacor Chemicals (International) S.A. · Inventors: Kwok, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Soluble Laminates, ABSTRACT OF THE DISCLOSURE A water soluble laminate may be prepared comprising one or more relatively water insoluble layers of polymers such as polyvinyl alcohol or crosslinked polyvinyl alcohol and one or more relatively more water soluble layers such as linear uncrosslinked sulphonated vinylarormatic polymers. -1-
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 January 6, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 6, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 6, 2014.
- 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.