US2641061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrostatic level
Assignee: Individual
•
Filing: 1951-01-08
•
Granted: 1953-06-09
•
Expires: 1971-01-08
Abstract
No abstract record available.
Inventors
- 👤 Charles E Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:00
CPC Classifications
G; G01; G01C; G01C5/00; G01C5/04; Y; Y10; Y10T; Y10T137/00; Y10T137/6851; Y10T137/6918; Y10T137/6954
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US277037A
Cited
US1566174A
Cited
FR38880E
Cited
US2158102A
Cited
US2218871A
Cited
US2384977A
Cited
US2532883A
Cited
US2558004A
Cited
US2587998A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-08 | 1956-12-08 | 1957-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-08 | 1960-12-08 | 1961-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-08 | 1964-12-08 | 1965-06-09 | $7700.00 | Window Closed / Lapsed |