US2581427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid level gauge for ballast tanks
Assignee: Individual
•
Filing: 1947-05-24
•
Granted: 1952-01-08
•
Expires: 1967-05-24
Abstract
No abstract record available.
Inventors
- 👤 Joseph N Matthews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:09
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/14; G01F23/16; G01F23/165; G01F23/168; E; E02; E02F; E02F7/00; E02F7/04
Claims Analysis
Total Claims: 0
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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) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |