Biodegradable polyester and natural polymer laminates
CA 2230728 A1 · Owner: Lawton, John W. Jr. · Inventors: Doane, William M.; Lawton, John W. Jr.; Shogren, Randal
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Articles are provided in which a self-supporting structure formed of natural polymer has a self-adherent, moisture resistant hydroxy-functional polyester on the structure surface. The self-supporting structure preferably is a starch and polyvinyl alcohol blend in an expanded form. The articles typically do not delaminate even when soaked in water, and are biodegradable.
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 June 13, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 13, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 13, 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.