Culvert end guard
CA 1234766 A · Owner: Appelt, Alfred G. · Inventors: Piercy, Eugene B.; Appelt, Alfred G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A culvert end guard for preventing the clogging of a culvert pipe by beavers includes a skeletal frame for mounting on the open end of the culvert; a gate defined by a plurality of parallel crossbars normally resting on the open inclined, outer end of the frame and a first chain interconnecting the crossbars and pivotal connecting the gate to the frame; and a second chain connected to the first chain for rotating the gate to the open position. In use, the gate catches debris while permitting the passage of water. Periodically the, gate is moved to the open position by pulling on the second chain either manually or by attaching it to a vehicle with the effect, of removing debris. The gate is …
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 April 5, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 5, 2005.
- 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.