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Patent
D394878
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Priority
Apr 21 1997
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Filed
Apr 21 1997
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Issued
Jun 02 1998
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Expiry
Jun 02 2012
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Assg.orig
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Entity
unknown
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7
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16
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n/a
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The ornamemtal design for an arithmetic instructional apparatus, as shown and described.
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FIG. 1 is a plan view of an arithmetic instructional device showing my new
design;
FIG. 2 is a side view of the arithmetic instructional device of FIG. 1;
and,
FIG. 3 is a bottom view of the arithmetic instructional device of FIG. 1.
The FIG. 1 view has been shaded to indicate color.
Perez, Irma Maritza
| Patent |
Priority |
Assignee |
Title |
| 1662503, |
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| 199721, |
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| 2567497, |
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| 284576, |
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| 2908439, |
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| 3419973, |
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| 3624928, |
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| 4372742, |
Oct 21 1981 |
|
Arithmetical teaching aid |
| 4399353, |
Jul 23 1981 |
|
Color computer wheel |
| 4424039, |
Sep 29 1982 |
|
Mathematics teaching device |
| 4445865, |
Jan 14 1983 |
A DAIGGER & COMPANY, INC |
Method of teaching mathematics |
| 4790757, |
Oct 19 1986 |
Kawai Gakki Seisakusho Co, Ltd |
Instrument for practicing multiplication |
| 5018976, |
Jan 11 1990 |
|
Teaching system for enhancing the learning of sets of facts |
| 666070, |
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| 962441, |
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| D354314, |
Jan 19 1993 |
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Dart bowling game |
| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Date |
Maintenance Fee Events |
n/a
| Date |
Maintenance Schedule |
n/a