Electric screen device
CA 2269831 C · Owner: Tamakoshi, Daisuke · Inventors: Suzaki, Tomohiko; Tamakoshi, Daisuke; Maehata, Hidehiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electric screen device 2 for preventing creatures from intruding into a water channel 1, which comprises a pair of opposed electrode assemblies 12, 12 disposed on opposite sides of a water intake channel 1, and a do pulse applying device 13 for applying do pulses between said electrode assemblies 12 12. In such electric screen device, the product of the peak value of the intensity of an electric field produced between the electrode assemblies 12, 12 by said do pulse applying device 13 and the body length of creatures to be prevented from intrusion into the water channel is not less than 0.1 V the do pulse applying time is within the range of 2 - 200 msec, and the duty factor of the do …
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 19, 1998 and granted July 30, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 19, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 19, 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.