Patent US3131488A successfully refreshed from Google Patents.
US3131488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for teaching mathematics
Assignee: Individual
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Filing: 1961-01-05
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Granted: 1964-05-05
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Expires: 1981-01-05
Abstract
No abstract record available.
Inventors
- 👤 Marguerite B Slater
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:39
CPC Classifications
G; G09; G09B; G09B19/00; G09B19/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
193 words
EDUCATIONAL APPARATUS FOR THE TEACHING OF ELEMENTARY ADDITION OR SUBTRACTION FACTS ABOUT A CONSECUTIVE SERIES OF CARDINAL NUMBERS, COMPRISING (A) A PLURALITY OF WORKSPACES EACH OF A DIFFERENT AREA CORRESPONDING TO A DIFFERENT CARDINAL NUMBER IN SAID SERIES, BUT ALL BASED ON THE SAME AREA UNIT, (B) IN COMBINATION WITH TILES WHOSE AREAS ARE BASED ON THE SAME UNIT, (C) THERE BEING A SET OF TILES FOR EACH WORKSPACE, INCLUDING (D) A TILE OF THE SAME SIZE AND SHAPE AS SAID WORKSPACE AND OTHER TILES OF LESSER SIZE THAN THE WORKSPACE, (E) NOT MORE THAN TWO OF SAID LESSER TILES HAVING THE SAME SIZE AND SHAPE, (F) AND EACH LESSER TILE BEING OF A SIZE AND SHAPE SUCH THAT WHEN PUT IN A GROUPING WITH ONE OTHER LESSER TILE FILLS THE WORKSPACE, (G) IN WHICH THE NUMBER OF LESSER TILES FOR EACH SET EQUALS NOT MORE THAN THE CARDINAL NUMBER ABOUT WHICH FACTS ARE BEING TAUGHT AND NOT FEWER THAN ONE LESS THAN SAID NUMBER; WHEREBY EACH ELEMENTARY ADDITION FACT FOR EACH OF SAID CARDINAL NUMBERS CAN BE TAUGHT BY PUTTING NOT MORE THAN TWO TILES IN THE WORKSPACE CORRESPONDING TO SAID NUMBER.
Claim 2
Dependent Claim
193 words
EDUCATIONAL APPARATUS FOR THE TEACHING OF ELEMENTARY ADDITION OR SUBTRACTION FACTS ABOUT A CONSECUTIVE SERIES OF CARDINAL NUMBERS, COMPRISING (A) A PLURALITY OF WORKSPACES EACH OF A DIFFERENT AREA CORRESPONDING TO A DIFFERENT CARDINAL NUMBER IN SAID SERIES, BUT ALL BASED ON THE SAME AREA UNIT, (B) IN COMBINATION WITH TILES WHOSE AREAS ARE BASED ON THE SAME UNIT, (C) THERE BEING A SET OF TILES FOR EACH WORKSPACE, INCLUDING (D) A TILE OF THE SAME SIZE AND SHAPE AS SAID WORKSPACE AND OTHER TILES OF LESSER SIZE THAN THE WORKSPACE, (E) NOT MORE THAN TWO OF SAID LESSER TILES HAVING THE SAME SIZE AND SHAPE, (F) AND EACH LESSER TILE BEING OF A SIZE AND SHAPE SUCH THAT WHEN PUT IN A GROUPING WITH ONE OTHER LESSER TILE FILLS THE WORKSPACE, (G) IN WHICH THE NUMBER OF LESSER TILES FOR EACH SET EQUALS NOT MORE THAN THE CARDINAL NUMBER ABOUT WHICH FACTS ARE BEING TAUGHT AND NOT FEWER THAN ONE LESS THAN SAID NUMBER; WHEREBY EACH ELEMENTARY ADDITION FACT FOR EACH OF SAID CARDINAL NUMBERS CAN BE TAUGHT BY PUTTING NOT MORE THAN TWO TILES IN THE WORKSPACE CORRESPONDING TO SAID NUMBER.
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) | 1967-05-05 | 1967-11-04 | 1968-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-05 | 1971-11-04 | 1972-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-05 | 1975-11-04 | 1976-05-05 | $7700.00 | Window Closed / Lapsed |