Patent US5210844A successfully refreshed from Google Patents.
Patent US3290798A successfully refreshed from Google Patents.
US3290798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Educational device
Assignee: Individual
•
Filing: 1964-07-20
•
Granted: 1966-12-13
•
Expires: 1984-07-20
Abstract
No abstract record available.
Inventors
- 👤 Edward J Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:56
CPC Classifications
G; G09; G09B; G09B19/00; G09B19/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A METHEMATICAL PROBLEM AND ANSWER DEVICE COMPRISING: A FIRST TABLE HAVING A ROW OF SEPARATE NUMERICAL RELATIONSHIPS; A SECOND TABLE HAVING A PLURALITY OF ROWS OF MATHEMATICAL SYMBOLS AND ADJACENT CORRELATIVE ROWS OF OPENINGS FOR RECEIVING PUZZLE PIECES; SAID FIRST TABLE AND SAID SECOND TABLE INCLUDING ALIGNMENT MEANS THEREBETWEEN ALLOWING SAID ROW OF NUMERICAL RELATIONSHIPS TO BE SELECTIVELY POSITIONED ADJACENT ONE OF SAID PLURALITY OF ROWS OF SYMBOLS AND THE CORRELATIVE ROW OF OPENINGS; A PLURALITY OF SEPARATE PUZZLE PIECES, EACH CONTAINING AN ANSWER TO A PARTICULAR MATHEMATICAL RELATIONSHIP BETWEEN SAID NUMERICAL RELATIONSHIPS; AND SAID PIECES AND OPENINGS HAVING RESPECTIVE INTERFITTING CODE MEANS THEREON ALLOWING RECEPTION OF EACH PUZZLE PIECE IN THE PROPER OPENING TO INDICATE THE CORRECT ANSWER TO EACH NUMERICAL RELATIONSHIP.
Claim 2
Dependent Claim
123 words
A METHEMATICAL PROBLEM AND ANSWER DEVICE COMPRISING: A FIRST TABLE HAVING A ROW OF SEPARATE NUMERICAL RELATIONSHIPS; A SECOND TABLE HAVING A PLURALITY OF ROWS OF MATHEMATICAL SYMBOLS AND ADJACENT CORRELATIVE ROWS OF OPENINGS FOR RECEIVING PUZZLE PIECES; SAID FIRST TABLE AND SAID SECOND TABLE INCLUDING ALIGNMENT MEANS THEREBETWEEN ALLOWING SAID ROW OF NUMERICAL RELATIONSHIPS TO BE SELECTIVELY POSITIONED ADJACENT ONE OF SAID PLURALITY OF ROWS OF SYMBOLS AND THE CORRELATIVE ROW OF OPENINGS; A PLURALITY OF SEPARATE PUZZLE PIECES, EACH CONTAINING AN ANSWER TO A PARTICULAR MATHEMATICAL RELATIONSHIP BETWEEN SAID NUMERICAL RELATIONSHIPS; AND SAID PIECES AND OPENINGS HAVING RESPECTIVE INTERFITTING CODE MEANS THEREON ALLOWING RECEPTION OF EACH PUZZLE PIECE IN THE PROPER OPENING TO INDICATE THE CORRECT ANSWER TO EACH NUMERICAL RELATIONSHIP.
References Cited (Backward Citations)
US1402807A
Cited
US1624450A
Cited
US1766465A
Cited
US1735456A
Cited
US1946318A
Cited
US2711595A
Cited
US2892267A
Cited
US3224114A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-12 | 1970-06-13 | 1970-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-12 | 1974-06-13 | 1974-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-12 | 1978-06-13 | 1978-12-13 | $7700.00 | Window Closed / Lapsed |