The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 19, 2002
Filed:
Nov. 11, 1999
Hidehiko Maehata, Osaka, JP;
Masanori Tsukahara, Osaka, JP;
Daisuke Tamakoshi, Osaka, JP;
Tomohiko Suzaki, Osaka, JP;
Yutaka Isawa, Osaka, JP;
Hitachi Zosen Corporation, , JP;
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 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.