US2997539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scanning mechanism
Assignee: Servo Corp of America
•
Filing: 1953-04-16
•
Granted: 1961-08-22
•
Expires: 1973-04-16
Abstract
No abstract record available.
Inventors
- 👤 Blackstone Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:51
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/02; H04N3/08; H04N3/09
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US34970A
Cited
US705771A
Cited
US1655185A
Cited
US1708746A
Cited
US1960514A
Cited
US1988303A
Cited
US2211320A
Cited
US2420951A
Cited
US2419459A
Cited
US2532098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |