US2581901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid level control device
Assignee: A P CONTROLS Corp
•
Filing: 1946-09-11
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Granted: 1952-01-08
•
Expires: 1966-09-11
Abstract
No abstract record available.
Inventors
- 👤 William A Biermann
- 👤 John T Dulak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:25
CPC Classifications
G; G05; G05D; G05D9/00; G05D9/02; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7329; Y10T137/7358; Y10T137/7381; Y10T137/7387; Y10T137/7404; Y10T137/794; Y10T137/8085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US786895A
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US945569A
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US959784A
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FR451463A
Cited
US1258790A
Cited
US1361878A
Cited
US2111744A
Cited
US2110100A
Cited
US2129937A
Cited
US2389519A
Cited
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 |