Methods for making magnetic strips
US5716460A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 1996 |
| Grant date | Feb 10, 1998 |
| Priority date | — |
| Expiry date | May 8, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D8/1266
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Methods for preparing magnetic strips are provided in which the strips are manufactured to a thickness of less than about 0.005 inches and are made of a iron-based alloy having a manganese content of from about 8 to about 18 weight percent. The thin strips can be prepared by annealing the alloy, then cold rolling the alloy to reduce its thickness by at least about 40% to produce an initial strip, thermally treating the initial strip between about 400.degree. C. and its austenitizing temperature, cold rolling the initial strip to reduce its thickness by at least 75% to below about 0.005 inches, and thermally treating this strip at a temperature of at least 525.degree. C. for a period of time between about 0.1 and about 3 minutes. The strips are particularly useful in electronic article surveillance systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.