Multi-core, multi-cover golf ball
CA 2234036 C · Owner: Melvin, Terrence · Inventors: Sullivan, Michael J.; Melvin, Terrence; Nesbitt, Dennis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A solid golf ball comprising a solid core and a cover enclosing the core. The core includes a center core layer and an outer core layer enclosing the center core layer the, center core layer having a specific gravity that differs from the specific gravity of the outer core layer by more than 0 1. The cover includes an inner cover layer formed over the core and an outer cover layer enclosing the inner cover layer the outer cover layer, having a Shore D hardness less than that of the inner core layer and no more than 55.
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 April 6, 1998 and granted February 12, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 6, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 6, 2020.
- 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.