US2494362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Educational blackboard
Assignee: Individual
•
Filing: 1946-07-02
•
Granted: 1950-01-10
•
Expires: 1966-07-02
Abstract
No abstract record available.
Inventors
- 👤 Schatz Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:12
CPC Classifications
G; G09; G09B; G09B17/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US98773A
Cited
US296900A
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US488411A
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US536526A
Cited
US651275A
Cited
US718520A
Cited
US770841A
Cited
US1246860A
Cited
GB191504752A
Cited
US2087043A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-09 | 1953-07-11 | 1954-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-09 | 1957-07-11 | 1958-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-09 | 1961-07-11 | 1962-01-10 | $7700.00 | Window Closed / Lapsed |