Starch based natural adhesive for use in cigarette manufacture
CA 2084349 C · Owner: Walker, John W. · Inventors: Eden, James L.; Walker, John W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An adhesive for use in cigarette manufacturing which is a natural based liquid starch phosphate material having good flow or fluidity characteristics and viscosity stability and comprises a phosphorylated starch material made from a fluidity or converted starch having a high amylopectin content the final starch, phosphate composition prepared by steam injection cooking the phosphorylated starch at high temperature and pressure.
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 December 2, 1992 and granted November 4, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 2, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 2, 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.