Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1985-08-01
1987-08-11
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
340551, G08B 1326
Patent
active
046865160
ABSTRACT:
An electronic surveillance system marker comprises an active component responsive to incident magnetic energy for causing an associated article surveillance system to render an output alarm and deactivatable, through change in the molecular organization of the active component, without requirement for disruption of the unitary character of the component or change in its chemical composition. The marker component is selected to be of molecularly unorganized, e.g., amorphous, matter and the deactivation step involves molecularly organizing such matter, e.g., by rendering crystalline at least a portion of the component. The amorphous matter is preferably selected to be a metal composition. The deactivation step is desirably practiced by maintaining such portion of the marker component at a temperature above the crystallization temperature of the component and thereby to crystallize a coercive force in the portion different from the coercive force in the remainder of the component. Alternatively, the marker component is selected to have retained stress which is mechanically constrained therein, the deactivation step involving the relieving of such retained mechanical stress.
REFERENCES:
patent: 4484184 (1984-11-01), Gregor et al.
Jaffe, Erwin, The Science of Physics in Lithography, Graphic Arts Technical Foundation, Inc., New York, 1964, p. 64.
Anthony, Wm. A. et al., Elementary Textbook of Physics, John Wiley & Sons, New York, 1897, p. 281.
Knowlton, Physics for College Students, McGraw-Hill, New York, 1928, pp. 561-562.
Sensormatic Electronics Corporation
Swann III Glen R.
LandOfFree
Method, system and apparatus for use in article surveillance does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method, system and apparatus for use in article surveillance, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method, system and apparatus for use in article surveillance will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-405468