US2871830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable authority servo
Assignee: Northrop Grumman Corp
•
Filing: 1956-05-04
•
Granted: 1959-02-03
•
Expires: 1976-05-04
Abstract
No abstract record available.
Inventors
- 👤 Edward C Wirth
- 👤 Wallace B Pierce
- 👤 Alvin R Vogel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:22
CPC Classifications
F; F15; F15B; F15B9/00; F15B9/02; F15B9/08; F15B9/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1231628A
Cited
US1500685A
Cited
US1719875A
Cited
US2016727A
Cited
US2366382A
Cited
US2652812A
Cited
US2738772A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-02 | 1962-08-04 | 1963-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-02 | 1966-08-04 | 1967-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-02 | 1970-08-04 | 1971-02-03 | $7700.00 | Window Closed / Lapsed |