US2970387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Question and answer device
Assignee: Individual
•
Filing: 1959-01-29
•
Granted: 1961-02-07
•
Expires: 1979-01-29
Abstract
No abstract record available.
Inventors
- 👤 Ralph L Dean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:03
CPC Classifications
G; G09; G09B; G09B3/00; G09B3/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US455100A
Cited
US602700A
Cited
US1749226A
Cited
US2157058A
Cited
US2704210A
Cited
US2690621A
Cited
US2887006A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-07 | 1964-08-08 | 1965-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-07 | 1968-08-08 | 1969-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-07 | 1972-08-08 | 1973-02-07 | $7700.00 | Window Closed / Lapsed |