Puncture sealant formulation
CA 2116135 C · Owner: Michelin Recherche Et Technique S.A. · Inventors: Sanda, Joseph Charles, Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention resides in a sealant composition for pressurized articles, and in the articles comprising the sealant. The present invention is particularly useful as a sealant for high pressure tires, adapted for pressures higher than 50 psig (345 kPa). The sealant of the present invention comprises a high molecular weight elastomer, a low molecular weight liquid elastomer and a cross-linking agent: The low molecular weight liquid elastomer is substantially free of iron.
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 June 17, 1993 and granted August 31, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 17, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 17, 2015.
- 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.