Apparatus for closing off shafts
CA 2040607 C · Owner: Mangas, Claude Raymond · Inventors: Mangas, Claude Raymond
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention concerns a device to plug (10) the end (4) of a hollow shaft (1) with interior grooves. The device (10) comprises a sleeve (11) which adapts in a watertight fashion to the bore (2) of the shaft (1) and comprises exterior grooves (14) that fit into the interior grooves of the shaft. The sleeve (11) is mounted on a locking-unlocking (10a) mechanism comprising a pin (15) imperviously mounted into the bore (16) of the sleeve (11) a control knob attached to the end of the pin and partially covering the end (4) of the hollow shaft (1) and an interlocking device (18) attached to the other end of the pin (15) capable of sliding along the interior grooves and locking itself onto the …
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 16, 1991 and granted June 9, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 16, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 16, 2013.
- 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.