Electronic flea repelling device with means for carrying collar strap behind the device housing
US4748938A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 30, 1987 |
| Grant date | Jun 7, 1988 |
| Priority date | — |
| Expiry date | Mar 30, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01K27/009
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Fleas are repelled from a four-legged animal by compressional waves derived from an electric-compressional wave transducer driven by electronic circuitry powered by a battery. The battery, circuitry and transducer are mounted in a housing carried by a collar around the neck of the animal. The housing includes a first face having an aperture covered by a dust screen. A face of the transducer positioned behind the dust screen radiates compressional wave energy through the dust screen that is reflected from the ground beneath the animal back to the underneath portions of the animal. The duty cycle and frequency of ultrasonic pulses derived by the transducer cause the fleas to be repelled. A second face, opposite from the first face, abuts against the body of the animal and carries a frangible, spring-like plate having a pair of slots through which the collar extends. The plate spring properties and the frictional force of the strap in the slots maintain the housing in situ on the neck of the animal, so the compressional waves are directed to the ground. If the animal becomes trapped by the housing, the plate breaks between the slot and an edge of the plate in response to the animal tu…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.