Tree shelters
CA 1300883 C · Owner: Hurlstone, Graham Frank · Inventors: Hurlstone, Graham Frank
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A tree shelter 10 comprises a twin-walled tubular extrusion of UV-degradable polypropylene formed with an out-turned lip or flange 28 at its upper end and a longitudinal V-section channel receiving a stake 26 which is securable therein by two ratchet-locking cable ties 32.
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 May 19, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 19, 2009.
- 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.