Golf ball containing optical brightener blend
CA 2116398 C · Owner: Lisco, Inc. · Inventors: Sullivan, Michael J.; Binette, Mark L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A golf ball with a visible outer layer containing a blend of about 0.01 - 0.05 parts by weight of a thiophene-type optical brightener and about 0.008 - 0.025 parts by weight of a second optical brightener selected from the group consisting of 2,2'-(1,2-ethenediyldi-4,1- phenylene)bisbenzoxazole and derivatives thereof the parts by weight of optical brightener being based upon 100 parts by weight of the polymeric material. The blend provides for a degree of whiteness comparable to that of 0.1 parts by weight of a thiophene-type optical brightener used alone and provides for better solubility than results from the use of higher concentrations of 2,2'-(1,2-ethenediyldi- …
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 24, 1994 and granted November 2, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 24, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 24, 2016.
- 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.