Expired Canadian patentCanada
Additive for compacted concrete pavement
CA 2026868 C · Owner: Uchida, Kiyohiko · Inventors: Inada, Kazuo; Ozakai, Noriyuki; Uchida, Kiyohiko
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is described an improved additive composition for use in roller compacted concrete pavement which comprises as an active ingredient a hydrolyzable tannin compound and a method of, producing the same.
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 October 3, 1990 and granted April 30, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 3, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 3, 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.
FiledOctober 3, 1990
GrantedApril 30, 1996
Term endedOctober 3, 2010
Patent numberCA 2026868 C
Classification (IPC)C04B24/04 +2 more
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.