US3424872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Record-reproduce machine with servocontrolled track selector
Assignee: PALISADES EDUCATIONAL FOUNDATION Inc
•
Filing: 1964-07-20
•
Granted: 1969-01-28
•
Expires: 1984-07-20
Abstract
No abstract record available.
Inventors
- 👤 Bruce N Whitlock
- 👤 William G Whitney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:06
CPC Classifications
G; G09; G09B; G09B5/00; G09B5/06; G09B19/00; G09B19/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1746959A
Cited
US2080100A
Cited
US2869966A
Cited
US2991448A
Cited
US2944116A
Cited
US3130393A
Cited
US3081431A
Cited
US3200385A
Cited
US3281959A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-28 | 1972-07-29 | 1973-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-28 | 1976-07-29 | 1977-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-28 | 1980-07-29 | 1981-01-28 | $7700.00 | Window Closed / Lapsed |