Golf ball
CA 2026588 C · Owner: Yamagishi, Katsunobu · Inventors: Fukui, Yasuhiro; Yamagishi, Katsunobu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A golf ball is disclosed which comprises a core and a, shell surrounding said core said core composed of (a) a, matrix formed of a first relatively hard rubber and (b) a, multiplicity of particles dispersed in said matrix and accounting for 10-65 % of the volume of said core said, particles being formed of a second relatively soft rubber and, having a particle size of greater than 0.8 mm but not greater than 7.0 mm. This golf ball provides long carry and distance and gives hands a soft strike shock.
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 October 1, 1990 and granted October 12, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 1, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 1, 2012.
- 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.