Indication device and article incorporating same

Details Indication device and article incorporating same Indication device and article incorporating same

2006-05-02

2006-05-02

Klimowicz, William J (Department: 2652)

Dynamic optical information storage or retrieval

Optical storage medium structure

C116S271000, C116S274000, C116S318000, C073S514040, C073S514090

Reexamination Certificate

active

07039927

ABSTRACT:
A disc or like article (10, 115, 119) rotatable by drive means, such as a compact disc for use with a computer, includes indication means (12, 110, 120) which, when the disc is rotated at or above a predetermined angular velocity, provide an indication that rotation has occurred, which indication can be important if the disc contains confidential information. The indication device can be a tube formed with two enclosures separated by a breakable membrane (15, 16, 112, 122), a colored liquid/gel (17, 111 121) being in one enclosure and passing into the second enclosure, by breaking the membrane, when the disc is spun, thereby providing a visual indication thereafter of the spinning having occurred The invention also relates to such an indication means, per se, for after-fitting to a disc recorded on by spinning, and to a method of producing a disc with said indication means.

REFERENCES:
patent: 3921434 (1975-11-01), Lowen et al.
patent: 5221186 (1993-06-01), Machin
patent: 6011772 (2000-01-01), Rollhaus et al.
patent: 6314907 (2001-11-01), Harris et al.
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patent: 60219559 (1985-11-01), None
patent: 11250644 (1999-09-01), None
patent: 11339442 (1999-12-01), None
“Rotation Sensor,” Jul. 1, 1967, IBM Technical Disclosure Bulletin,vol. 10, Iss. No. 2, page No. 137.

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