Expired Canadian patentCanada
Tertiary butyl derivatives of toluenediamine and mixtures as antioxidant for organic materials
CA 1294776 C · Owner: Air Products And Chemicals, Inc. · Inventors: Burgoyne, William Franklin Jr.; Dixon, Dale David
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to the use of tertiary butyl derivatives of toluenediamine and specifically 5-tert-butyl-2,4-toluenediamine as an antioxidant material for preventing oxidation of organic materials.
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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
- Granted January 28, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 28, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 27, 1987
GrantedJanuary 28, 1992
Term endedJanuary 28, 2009
Patent numberCA 1294776 C
Classification (IPC)C09K15/18 +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.