US2431281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control apparatus
Assignee: Brown Instruments Co
•
Filing: 1945-03-14
•
Granted: 1947-11-18
•
Expires: 1965-03-14
Abstract
No abstract record available.
Inventors
- 👤 Edgar M Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:25
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/22; G05D23/2236; G05D23/2237
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2153222A
Cited
GB495061A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-11-17 | 1951-05-19 | 1951-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-17 | 1955-05-19 | 1955-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-17 | 1959-05-19 | 1959-11-18 | $7700.00 | Window Closed / Lapsed |