Engineered wood structures
CA 2253495 C · Owner: Dooley, James H. · Inventors: Dooley, James H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An engineered wood structure (2) to act as large woody debris in stream and lake rehabilitation projects. It is made using a number of small logs (8) typically about six to ten, assembled into a cylindrical or frustroconical structure. Normally, spaced apart opposing log pairs are joined by spars (12) mortised into them at each end. Adjacent logs may additionally be doweled together at their ends. The spars (12) are sufficiently displaced longitudinally so that they do not interfere spatially with each other although they may be in contact. Radial protrusions (10) may be placed at one end or along the structure to simulate the root wad or limbs of a fallen tree to provide anchoring …
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 March 25, 1998 and granted July 30, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 25, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 25, 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.