US3412480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Education apparatus
Assignee: Individual
•
Filing: 1966-09-13
•
Granted: 1968-11-26
•
Expires: 1986-09-13
Abstract
No abstract record available.
Inventors
- 👤 Clyde A Connell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:23
CPC Classifications
G; G09; G09B; G09B5/00; G09B5/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2193745A
Cited
US2701981A
Cited
US3103750A
Cited
US3224112A
Cited
US3230642A
Cited
US3339288A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-26 | 1972-05-27 | 1972-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-26 | 1976-05-27 | 1976-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-26 | 1980-05-27 | 1980-11-26 | $7700.00 | Window Closed / Lapsed |