US3129518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for teaching mathematics
Assignee: Individual
•
Filing: 1961-09-21
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Granted: 1964-04-21
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Expires: 1981-09-21
Abstract
No abstract record available.
Inventors
- 👤 Robert E Burris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:23
CPC Classifications
G; G09; G09B; G09B19/00; G09B19/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A MATHEMATICS VISUAL TEACHING AID COMPRISING A BASE MEMBER, A PLURALITY OF RECEPTACLES CARRIED ON SAID BASE MEMBER, AND A PLURALITY OF EQUALLY DIMENSIONED STACKABLE PIECES, EACH OF SAID RECEPTACLES BEING DISPOSED ON SAID BASE MEMBER IN HORIZONTALLY AND VERTICALLY ALIGNED SPACED RELATION TO OTHER OF SAID RECEPTACLS TO PROVIDE A PLURALITY OF HORIZONTAL AND VERTICAL ROWS OF RECEPTACLES, EACH OF SAID RECEPTACLES HAVING A LONGITUDINALLY DISPOSED ELONGATE OPENING THEREIN, EACH OF SAID RECEPTACLES BEING DIMENSIONED TO RECEIVE A MAXIMUM OF NINE PIECES IN STACKED RELATION, AND A PLURALITY OF RETAINING MEANS FOR SUPPORTING AT LEAST ONE OF SAID PIECES, EACH OF SAID RETIANING MEANS BEING DISPOSED ADJACENT A DIFFERENT TWO OF SAID RECEPTACLES DISPOSED IN SIDE-BY-SIDE RELATION TO SERVE AS MEMORY DEVICES FOR RETAINING A PIECE INDICATIVE OF A NUM-BER TO BE CARRIED-OVER DURING A MATHEMATICAL OPERATION.
Claim 2
Dependent Claim
138 words
A MATHEMATICS VISUAL TEACHING AID COMPRISING A BASE MEMBER, A PLURALITY OF RECEPTACLES CARRIED ON SAID BASE MEMBER, AND A PLURALITY OF EQUALLY DIMENSIONED STACKABLE PIECES, EACH OF SAID RECEPTACLES BEING DISPOSED ON SAID BASE MEMBER IN HORIZONTALLY AND VERTICALLY ALIGNED SPACED RELATION TO OTHER OF SAID RECEPTACLS TO PROVIDE A PLURALITY OF HORIZONTAL AND VERTICAL ROWS OF RECEPTACLES, EACH OF SAID RECEPTACLES HAVING A LONGITUDINALLY DISPOSED ELONGATE OPENING THEREIN, EACH OF SAID RECEPTACLES BEING DIMENSIONED TO RECEIVE A MAXIMUM OF NINE PIECES IN STACKED RELATION, AND A PLURALITY OF RETAINING MEANS FOR SUPPORTING AT LEAST ONE OF SAID PIECES, EACH OF SAID RETIANING MEANS BEING DISPOSED ADJACENT A DIFFERENT TWO OF SAID RECEPTACLES DISPOSED IN SIDE-BY-SIDE RELATION TO SERVE AS MEMORY DEVICES FOR RETAINING A PIECE INDICATIVE OF A NUM-BER TO BE CARRIED-OVER DURING A MATHEMATICAL OPERATION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-21 | 1967-10-21 | 1968-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-21 | 1971-10-21 | 1972-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-21 | 1975-10-21 | 1976-04-21 | $7700.00 | Window Closed / Lapsed |