Patent US2533535A successfully refreshed from Google Patents.
US2533535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Educational apparatus
Assignee: Individual
•
Filing: 1945-09-17
•
Granted: 1950-12-12
•
Expires: 1965-09-17
Abstract
No abstract record available.
Inventors
- 👤 Tellier Andre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:52
CPC Classifications
G; G09; G09B; G09B27/00; G09B27/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US556486A
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US615098A
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US792336A
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US876948A
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US1141070A
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US1438153A
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US1419604A
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US1814984A
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US1912305A
Cited
US2105563A
Cited
US2172450A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |