Patent US2632962A successfully refreshed from Google Patents.
US2632962A
Expired / Lapsed
US
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Educational device
Assignee: KELJIKAN
•
Filing: 1951-04-11
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Granted: 1953-03-31
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Expires: 1971-04-11
Abstract
No abstract record available.
Inventors
- 👤 James J Jacobson
- 👤 John G Keljikan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:46
CPC Classifications
G; G09; G09B; G09B19/00; G09B19/06; G09B19/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US729955A
Cited
US1559459A
Cited
US1522328A
Cited
US1611604A
Cited
US1903778A
Cited
US2234249A
Cited
US2554445A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-30 | 1956-09-29 | 1957-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-30 | 1960-09-29 | 1961-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-30 | 1964-09-29 | 1965-03-31 | $7700.00 | Window Closed / Lapsed |