US3172216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Teaching machine
Assignee: Individual
•
Filing: 1961-07-10
•
Granted: 1965-03-09
•
Expires: 1981-07-10
Abstract
No abstract record available.
Inventors
- 👤 Richard C Mueiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:21
CPC Classifications
G; G09; G09B; G09B7/00; G09B7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2274811A
Cited
US2564089A
Cited
US2545381A
Cited
US2654163A
Cited
US2877568A
Cited
US2987828A
Cited
US3056215A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-08 | 1968-09-07 | 1969-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-08 | 1972-09-07 | 1973-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-08 | 1976-09-07 | 1977-03-09 | $7700.00 | Window Closed / Lapsed |