Demagnetizer for use in vehicles
US4388666A · kind A · utility
6Cited by
1References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 26, 1981 |
| Grant date | Jun 14, 1983 |
| Priority date | — |
| Expiry date | May 26, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F13/006
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A demagnetizer for removing residual magnetism in vehicles includes a single coil which is adapted to surround a portion or the whole of the body of a vehicle. A direct current and alternating current are supplied to the single coil simultaneously to produce a d.c. magnetic field and an a.c. magnetic field. The direction and magnitude of the d.c. magnetic field are so arranged, that the d.c. magnetic field cancels the external magnetic field. The magnitude of the a.c. magnetic field is varied within a predetermined range periodically to remove the residual magnetism.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.