US2556771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for maintaining a constant liquid level
Assignee: Individual
•
Filing: 1945-02-13
•
Granted: 1951-06-12
•
Expires: 1965-02-13
Abstract
No abstract record available.
Inventors
- 👤 Moore Richard Pierpont
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:32
CPC Classifications
G; G05; G05D; G05D9/00; G05D9/02; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7297; Y10T137/7358; Y10T137/7368; Y10T137/7371; Y10T137/7404; Y10T137/8593; Y10T137/86187; Y10T137/86228
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE552923C
Cited
US917381A
Cited
US937728A
Cited
US927899A
Cited
US1536055A
Cited
GB231603A
Cited
US1997970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-11 | 1954-12-11 | 1955-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-11 | 1958-12-11 | 1959-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-11 | 1962-12-11 | 1963-06-12 | $7700.00 | Window Closed / Lapsed |