Expired Canadian patentCanada
Non-toxic, stable lignosulfonate - urea - formaldehyde composition and method of preparing thereof
CA 2015776 C · Owner: Daishowa Chemicals Inc. · Inventors: Hollis, John W. Jr.; Schmitt, Linda G.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A non-toxic stable lignosulfonate - urea formaldehyde composition. The composition is particularly useful as a binder for animal feeds. A method of making the composition is also disclosed.
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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 30, 1990 and granted July 10, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 30, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 30, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 30, 1990
GrantedJuly 10, 2001
Term endedApril 30, 2010
Patent numberCA 2015776 C
Classification (IPC)C08L97/00
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.