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Class Information
Number: 434/331
Name: Education and demonstration > Question or problem eliciting response > Correctness of response indicated to examine by self-operating or examinee actuated means > By optical element (e.g., mirror, color filter, lens, etc.)
Description: Subject matter wherein the correctness of an examinee"s response is indicated by optical means.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7055823 |
Cards |
Jun. 6, 2006 |
| 6053741 |
Flash card holder and learning method |
Apr. 25, 2000 |
| 5701696 |
Card holder |
Dec. 30, 1997 |
| 5618180 |
Method of teaching using a computer |
Apr. 8, 1997 |
| 5447439 |
Interactive story book using stickers and a method of teaching |
Sep. 5, 1995 |
| 5314197 |
Game apparatus |
May. 24, 1994 |
| 5295695 |
Method of coding gifts |
Mar. 22, 1994 |
| 5190298 |
Amusement devices |
Mar. 2, 1993 |
| 4891011 |
System for assisting the learning of a subject |
Jan. 2, 1990 |
| 4731023 |
Teaching system using prerecorded tape |
Mar. 15, 1988 |
| RE32487 |
Binocular presentation of visual information |
Sep. 1, 1987 |
| 4674433 |
Correct answer displaying device for arithmetic practicing unit |
Jun. 23, 1987 |
| 4615682 |
Teaching system utilizing magnetic tape |
Oct. 7, 1986 |
| 4604065 |
Teaching or amusement apparatus |
Aug. 5, 1986 |
| 4521074 |
Binocular presentation of visual information |
Jun. 4, 1985 |
| 4286385 |
Color screen indicator |
Sep. 1, 1981 |
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