US2541880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotatable level
Assignee: Individual
•
Filing: 1947-02-04
•
Granted: 1951-02-13
•
Expires: 1967-02-04
Abstract
No abstract record available.
Inventors
- 👤 John L Mcmillan
- 👤 Emil W Schroeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:02
CPC Classifications
G; G01; G01C; G01C9/00; G01C9/18; G01C9/24; G01C9/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE87770C
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US281086A
Cited
US832326A
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US893992A
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US1592734A
Cited
US1830009A
Cited
US2129695A
Cited
US2305678A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-12 | 1954-08-14 | 1955-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-12 | 1958-08-14 | 1959-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-12 | 1962-08-14 | 1963-02-13 | $7700.00 | Window Closed / Lapsed |