Epoxy/amine barrier coatings
CA 2184406 C · Owner: Ppg Industries Ohio, Inc. · Inventors: Carlblom, Leland Henry
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polyepoxide-polyamine gas barrier coatings for use on packaging materials such as polymeric containers are provided with more stable low permeability at high humidity conditions by including high aromatic content in systems cured with a substantial excess of polyamine. The polyamine is an adduct of a polyamine having high aromatic content reacted with epichlorohydrin certain polyepoxides, novolac epoxy, resin bisphenof F epoxy resin, or formaldehyde/phenol Mannich bases. The polyamine adduct is cured with polyepoxide which also may have aromatic content, with the exclusion of bisphenol A epoxy resins.
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 February 7, 1995 and granted September 21, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 7, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 7, 2017.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.