Expired Canadian patentCanada
Rapid hair ph indication and solution therefor
CA 2011371 C · Owner: Tehrani, Nasser Norman · Inventors: Tehrani, Nasser Norman
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 solution for the rapid indication of hair pH and method of determining hair pH and restoration of hair to its isoionic range with buffered conditioning rinses.
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 March 2, 1990 and granted November 15, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 2, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 2, 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.
FiledMarch 2, 1990
GrantedNovember 15, 1994
Term endedMarch 2, 2010
Patent numberCA 2011371 C
Classification (IPC)G01N21/80 +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.