Patent US781250A successfully refreshed from Google Patents.
Patent US2826628A successfully refreshed from Google Patents.
US2826628A
Expired / Lapsed
US
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Educational apparatus
Assignee: Individual
•
Filing: 1954-01-26
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Granted: 1958-03-11
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Expires: 1974-01-26
Abstract
No abstract record available.
Inventors
- 👤 Olan E Kruse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:49
CPC Classifications
G; G09; G09B; G09B23/00; G09B23/06; G09B23/18; G09B23/183; G09B23/185
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1271641A
Cited
GB344668A
Cited
US1879623A
Cited
US1968039A
Cited
GB531455A
Cited
US2374800A
Cited
US2449568A
Cited
US2449550A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-10 | 1961-09-09 | 1962-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-10 | 1965-09-09 | 1966-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-10 | 1969-09-09 | 1970-03-11 | $7700.00 | Window Closed / Lapsed |