Patent US2440183A successfully refreshed from Google Patents.
US2440183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic regulating system having a movable control element and a follow-up element
Assignee: Sperry Gyroscope Co Ltd
•
Filing: 1944-02-19
•
Granted: 1948-04-20
•
Expires: 1964-02-19
Abstract
No abstract record available.
Inventors
- 👤 Nisbet Robert Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:32
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/08; G05D1/0808; G05D1/0816; G05D1/085; G01; G01C; G01C19/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
FR668388A
Cited
US2020847A
Cited
US2306346A
Cited
US2100934A
Cited
US2210916A
Cited
US2312464A
Cited
US2390119A
Cited
US2368628A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-20 | 1951-10-20 | 1952-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-20 | 1955-10-20 | 1956-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-20 | 1959-10-20 | 1960-04-20 | $7700.00 | Window Closed / Lapsed |