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Class Information
Number: 434/325
Name: Education and demonstration > Question or problem eliciting response > Image projector included in examining means > And light detector
Description: Subject matter wherein the examining means includes a light sensing means (e.g., photocell, etc.).
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6498921 |
Method and system to answer a natural-language question |
Dec. 24, 2002 |
| 6362812 |
Electronic device and display system employing the same |
Mar. 26, 2002 |
| 5011413 |
Machine-interpretable figural response testing |
Apr. 30, 1991 |
| 4808980 |
Electronic light pointer for a projection monitor |
Feb. 28, 1989 |
| 4378217 |
Terminal trainer keyboard and display apparatus for teaching keyboard operations and knowledge items |
Mar. 29, 1983 |
| 4122613 |
Operator responsive audio-visual teaching apparatus |
Oct. 31, 1978 |
| 4055906 |
Automated interrogating apparatus |
Nov. 1, 1977 |
| 4043054 |
Teaching machine |
Aug. 23, 1977 |
| 4034487 |
Automated testing stations |
Jul. 12, 1977 |
| 4005530 |
Audio-visual training device with selective branching |
Feb. 1, 1977 |
| 3968575 |
Teaching device |
Jul. 13, 1976 |
| 3942269 |
Audio-visual system including audio-visual slides |
Mar. 9, 1976 |
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