Polymer based magnetic tags

Details Polymer based magnetic tags Polymer based magnetic tags

1978-07-24

1980-04-15

Edmundson, F. C.

Compositions

Magnetic

With wax, bitumen, resin, or gum

149 2, 149 21, 252 6252, 252 6253, 25230133, C09K 300, C06B 4504, H01F 100

Patent

active

041983076

ABSTRACT:
Ferrite particles having a plurality of distinct Curie temperatures are encapsulated within a polymer matrix to provide tagging material especially useful in identifying explosive materials even after detonation. In one embodiment, phosphor is dispersed within the polymer matrix to facilitate collection of tag particles following detonation. The tags are also usable in tagging other articles, especially where harsh environmental conditions are likely to be encountered.

REFERENCES:
patent: 2601212 (1952-06-01), Polydoroff
patent: 3736500 (1973-05-01), Berkowitz
patent: 3772099 (1973-11-01), Ryan et al.
patent: 3861886 (1975-01-01), Meloy
patent: 3967990 (1976-07-01), Ryan et al.
patent: 4053433 (1977-10-01), Lee
patent: 4115534 (1978-09-01), Ithakissios
patent: 4131064 (1978-12-01), Ryan et al.

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