Tamper resistant magnetic stripes
Abstract
This invention relates to a magnetic stripe comprising a medium in which magnetized particles are suspended and in which the encoded information is recorded by actual physical rotation or alignment of the previously magnetized particles within the flux reversals of the stripe which are 180.degree. opposed in their magnetic polarity. The magnetized particles are suspended in a medium which is solid, or physically rigid, at ambient temperatures but which at moderately elevated temperatures, such as 40.degree. C., is thinable to a viscosity permissive of rotation of the particles therein under applications of moderate external magnetic field strengths within acceptable time limits.
- Inventors:
-
- Albuquerque, NM
- Issue Date:
- Research Org.:
- AT&T
- OSTI Identifier:
- 872650
- Patent Number(s):
- 5981053
- Assignee:
- Sandia Corporation (Albuquerque, NM)
- Patent Classifications (CPCs):
-
G - PHYSICS G06 - COMPUTING G06K - RECOGNITION OF DATA
G - PHYSICS G11 - INFORMATION STORAGE G11B - INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- DOE Contract Number:
- AC04-76DP00789
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- tamper; resistant; magnetic; stripes; relates; stripe; comprising; medium; magnetized; particles; suspended; encoded; information; recorded; physical; rotation; alignment; previously; flux; reversals; 180; degree; opposed; polarity; solid; physically; rigid; ambient; temperatures; moderately; elevated; 40; thinable; viscosity; permissive; therein; applications; moderate; external; field; strengths; acceptable; time; limits; elevated temperatures; magnetic field; elevated temperature; ambient temperature; field strength; ambient temperatures; external magnetic; particles therein; stripe comprising; magnetic polarity; encoded information; /428/235/283/427/
Citation Formats
Naylor, Richard Brian, and Sharp, Donald J. Tamper resistant magnetic stripes. United States: N. p., 1999.
Web.
Naylor, Richard Brian, & Sharp, Donald J. Tamper resistant magnetic stripes. United States.
Naylor, Richard Brian, and Sharp, Donald J. Fri .
"Tamper resistant magnetic stripes". United States. https://www.osti.gov/servlets/purl/872650.
@article{osti_872650,
title = {Tamper resistant magnetic stripes},
author = {Naylor, Richard Brian and Sharp, Donald J},
abstractNote = {This invention relates to a magnetic stripe comprising a medium in which magnetized particles are suspended and in which the encoded information is recorded by actual physical rotation or alignment of the previously magnetized particles within the flux reversals of the stripe which are 180.degree. opposed in their magnetic polarity. The magnetized particles are suspended in a medium which is solid, or physically rigid, at ambient temperatures but which at moderately elevated temperatures, such as 40.degree. C., is thinable to a viscosity permissive of rotation of the particles therein under applications of moderate external magnetic field strengths within acceptable time limits.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1999},
month = {Fri Jan 01 00:00:00 EST 1999}
}
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Works referenced in this record:
Magnetic recording properties of SmCo5
journal, September 1978
- Fayling, R.; Bendson, S.
- IEEE Transactions on Magnetics, Vol. 14, Issue 5, p. 752-754