Racket with improved shaft
CA 1286332 C · Owner: Hong, Jin-San · Inventors: Hong, Jin-San
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Racket with Improved Shaft " A racket comprising a head and a handle shaft and including a waved zone at a predetermined location in the handle shaft, whereby the bottom of said waved zone acts as an inflection point of oscillation and such point being easily recognizable from its appearance. The waved zone can store more potential energy than that of a convention design because of stress concentration, and release of the potential energy will provide additional impact force. Furthermore upon hitting, there is a strain at the waved zone greater than that in a conventional design, and thus the degree of oscillation is increased, duration of impact between incoming ball and strung surface of …
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 16, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 16, 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.