US2141056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positional control system
Assignee: Sperry Gyroscope Co Inc
•
Filing: 1936-03-19
•
Granted: 1938-12-20
•
Expires: 1956-03-19
Abstract
No abstract record available.
Inventors
- 👤 Frederic M Watkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:59
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/149
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1941-12-19 | 1942-06-20 | 1942-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-12-19 | 1946-06-20 | 1946-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-12-19 | 1950-06-20 | 1950-12-20 | $7700.00 | Window Closed / Lapsed |