Color balanced rubber-reinforced plastic
CA 1286815 C · Owner: Donald, Robert James · Inventors: Donald, Robert James; Yanacek, James A.; Murphy, Christopher S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The color stability of certain rubberreinforced polymeric compositions upon exposure to ultraviolet (UV) light is enhanced by incorporating a fadeable, yellow color balancer in an amount effective to reduce the overall color shift of the plastic due to exposure to UV light. The color balancer is an organic dye or pigment, preferably an anthraquinone dye present in an amount (0.001 to 0.1 weight percent) below that at which it would be used to color the composition. 34,602-F
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 July 23, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 23, 2008.
- 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.