Process for the production of biodegradable packaging from biaxially stretched films
CA 2443161 C · Owner: Trespaphan Gmbh · Inventors: Busch, Detlef D.; Rosenbaum, Sonja (Deceased)
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method for the plastic shaping of a biaxially-drawn film, comprising at , least one base layer containing at least one polymer (I), made from at least one , hydroxycarboxylic acid and >= 0.2 wt. % based on the weight of the , layer, of a thermoplastic polymer (II), different from polymer (I). Said film is plastically moulded by application of , pneumatic and/or mechanical forces.
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 April 23, 2002 and granted June 28, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 23, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 23, 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.