Method for preparing a biodegradable filter material
CA 2233368 C · Owner: Schmidt, Harald · Inventors: Lorcks, Jurgen; Schmidt, Harald
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a biodegradable filter tow or filter material (1) of renewable raw materials for use as tobacco filter elements for cigarettes cigars or pipes, as well as a process for its manufacture. Fibres foils or , foams produced in an extrusion process and consisting of biopolymers based on thermoplastic starch and their polymer mixture are processed to form the filter tow or filter material according to the invention. The advantages of the invention reside in the use of biodegradability of the natural biopolymer filter material, a pollutant-reducing aroma-enhancing filter effect and an economical manufacturing method.
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 September 27, 1996 and granted December 5, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 27, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 27, 2018.
- 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.