Variable weight playball
CA 2129713 A1 · Owner: Spector, Donald · Inventors: Spector, Donald
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A variable-weight playball whose outer casing is formed of liquid-impervious, flexible material having a, closable port therein. Confined within the casing is a compressible body having the same configuration which depends on whether the ball is spherical or in some other shape. The body is formed of low-density open-cell, flexible foam plastic material having sponge-like properties. To impart heft to the ball water is, introduced through the port into the body and absorbed thereby, the port then being closed to retain the water. To thereafter lighten the ball the port is opened and the, ball is squeezed to discharge water through the port until the ball has the desired reduced weight after …
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 August 8, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 8, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 8, 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.