Indication device and article incorporating same
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 2, 2006
Grant Date -
Feb 13, 2003
app pub date -
Mar 14, 2001
filing date -
Mar 18, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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