Electric screen device
US6357390B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 11, 1999 |
| Grant date | Mar 19, 2002 |
| Priority date | — |
| Expiry date | Nov 11, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05C1/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric screen device for preventing creatures from intruding into a water channel, which comprises a pair of opposed electrode assemblies disposed on opposite sides of a water intake channel, and a dc pulse applying device 13 for applying dc pulses between the electrode assemblies. In such electric screen device, the product of the peak value of the intensity of an electric field produced between the electrode assemblies by the dc pulse applying device and the body length of creatures to be prevented from intrusion into the water channel is not less than 0.1 V, the dc pulse applying time is within the range of 2-200 msec, and the duty factor of the dc pulse is not more than 0.5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.