Windowed rotatable cover which reveals one indicia on one surface and a second indicia on a second surface corresponding to the first that encodes and decodes messages
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United States of America Patent
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Sep 3, 1991
Grant Date -
N/A
app pub date -
Apr 9, 1990
filing date -
Apr 9, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A simple and inexpensive apparatus for encoding and decoding messages is disclosed. The apparatus comprises a first surface having a first series of indicia and a second surface having a series of letters. Each of the letters correspond to a unique one of the indicia. The device further includes a cover for rotating one of the surfaces through a plurality of positions and sequentially revealing one of the indicia and its corresponding letter.
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