Expired Canadian patentCanada
Polyesters from terephthalic acid, 2,6-naphthalenedicarboxylic acid and hydroquinone
CA 2094375 C · Owner: Eastman Chemical Company · Inventors: Morris, John C.; Bradley, James R.; Jackson, Winston J. Jr.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are melt-processable wholly aromatic polyesters prepared from terephthalic acid 2,6-naphthalenediacarboxylic, acid, and hydroquinone.
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 November 15, 1991 and granted October 14, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 15, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 15, 2013.
- 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 15, 1991
GrantedOctober 14, 1997
Term endedNovember 15, 2011
Patent numberCA 2094375 C
Classification (IPC)C08G63/18 +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.