US2531200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic control system using nonlinear responsive elements
Assignee: Leeds and Northrup Co
•
Filing: 1944-10-10
•
Granted: 1950-11-21
•
Expires: 1964-10-10
Abstract
No abstract record available.
Inventors
- 👤 Elwood T Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:42
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/27; G05D23/1906
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |