with invisibly printed correct answer; the answer being rendered visible by special optical means

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CPC
G09B3/045

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Parent Industries

GPHYSICS G09Cryptography, education, displays G09BEDUCATIONAL OR DEMONSTRATION APPLIANCES APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE MODELS PLANETARIA GLOBES MAPS DIAGRAMS G09B3/00Manually or mechanically operated teaching appliances working with questions and answers

Current Industry

G09B3/045with invisibly printed correct answer; the answer being rendered visible by special optical means

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Patents Grantslast 30 patents

Information Patent Grant
Multisensory interface control method, multisensory interface contr...
- Patent number 10,563,997
- Issue date Feb 18, 2020
- DENSO CORPORATION
- Ryo Kyung Lee
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Image display device, image display method, and computer program
- Patent number 10,228,895
- Issue date Mar 12, 2019
- Sony Corporation
- Yasushi Miyajima
- G06 - COMPUTING CALCULATING COUNTING

Patents Applicationslast 30 patents

Information Patent Application
MULTISENSORY INTERFACE CONTROL METHOD, MULTISENSORY INTERFACE CONTR...
- Publication number 20170314951
- Publication date Nov 2, 2017
- Denso Corporation
- Ryo Kyung Lee
- G02 - OPTICS
Information Patent Application
IMAGE DISPLAY DEVICE, IMAGE DISPLAY METHOD, AND COMPUTER PROGRAM
- Publication number 20140125558
- Publication date May 8, 2014
- SONY CORPORATION
- Yasushi Miyajima
- G02 - OPTICS