Polyurethane tire sidewalls
CA 1098773 A · Owner: Firestone Tire & Rubber Company (The) · Inventors: Roberts, Durward T. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pneumatic tire having polyurethane in the surface exposed at the sidewall is coated with a colored polyurethane elastomeric coating by (1) applying to the sidewall surface a colored coating composition comprising a dye and/or pigment an, elastomeric NCO-terminated polyurethane prepolymer and a curing agent therefor, wherein the prepolymer is formed from a substantially satured hydroxy-terminated diol having a molecular weight of 500 to 10,000 or higher and a substantially saturated aliphatic diisocyanate, the mol ratio of the diisocyanate to the diol being 1.2:1 to 2.2:1, the prepolymer having a molecular weight over 2,500 when a blocked diamine is used as curing agent and (2) heating the …
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
- Granted April 7, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 7, 1998.
- 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.