Invisible ink quiz game
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
N/A
Issued Date -
Aug 4, 2005
app pub date -
Feb 3, 2004
filing date -
Feb 3, 2004
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A reusable sequential information display device includes a printed substrate that includes on a display surface with indicia visualized under ambient light to form a first informational statement. Indicia formed of an ink visualized under light wavelengths of less than 420 nanometers is also applied to the display surface to form a second informational statement. A reader contains a light-emitting diode producing an emission wavelength of less than or equal to the wavelength required to visualize the invisible ink. The light-emitting diode, a battery and a switch for selectively forming an electrical circuit between the light-emitting diode and battery are located within a reader. A query-answer educational game is formed and optionally includes a light-emission timer and/or a sound synthesizer.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully