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US2662306A
Expired / Lapsed
US
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Reading-training device
Assignee: Individual
•
Filing: 1950-09-01
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Granted: 1953-12-15
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Expires: 1970-09-01
Abstract
No abstract record available.
Inventors
- 👤 Archie J Mcmaster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:59
CPC Classifications
G; G09; G09B; G09B17/00; G09B17/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US918176A
Cited
US986048A
Cited
US1587886A
Cited
US2159882A
Cited
US2061532A
Cited
US2098020A
Cited
US2265924A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-14 | 1957-06-15 | 1957-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-14 | 1961-06-15 | 1961-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-14 | 1965-06-15 | 1965-12-15 | $7700.00 | Window Closed / Lapsed |