公开(公告)号：US3636559A

公开(公告)日：1972-01-18

申请号：US3636559D

申请日：1968-11-18

Applicant: RAT ELIMINATION SYSTEM LTD THE

Inventor： GRANDE DOMINIC DEL ,  ERDMAN DONALD C

IPC: B06B1/02 ,  G08B3/10

CPC classification number: B06B1/0284 ,  A01M29/18 ,  B06B2201/20 ,  B06B2201/75

Abstract: Apparatus and method for repelling rats and mice from an area by means of generation of a modulated ultrasonic sound level. The sound level is frequency modulated within a range of ultrasonic frequencies to which rats and mice respond. In addition, it is amplitude modulated in a random manner. The modulations of the signal prevent rats and mice from adapting to the sound, and thereby renders the sound particularly unpleasant to them.