Selective fixation method for producing permanent magnetic recor

Details Selective fixation method for producing permanent magnetic recor Selective fixation method for producing permanent magnetic recor

1977-10-27

1979-06-19

Lucas, Jay P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data verification

340149A, 346 741, G11B 1304, G11B 502, G03G 1900

Patent

active

041588622

ABSTRACT:
Permanent magnetic recordings are made by orienting the magnetic particles f a polymerizable ink in a first direction, then selectively polymerizing the ink to fix some of the particles in the first direction. The remaining particles are then oriented in a second direction and the previously unpolymerized portions of the ink are polymerized, while the ink is kept in a magnetic field tending to orient the particles in the second direction to prevent the particles fixed in the first direction from blurring the magnetic pattern before the polymerization is effective to lock it in completely. Such recordings are particularly useful for ID cards.

REFERENCES:
patent: 3662397 (1972-05-01), Ballinger
patent: 3803633 (1974-04-01), Duck
patent: 3845499 (1974-10-01), Ballinger
patent: 3873975 (1975-03-01), Miklos
patent: 3878367 (1975-04-01), Fayling
patent: 3947879 (1976-03-01), Stauffer

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