US2506937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant level liquid control device
Assignee: AUTOMATIC PRODUCTS CO
•
Filing: 1946-09-27
•
Granted: 1950-05-09
•
Expires: 1966-09-27
Abstract
No abstract record available.
Inventors
- 👤 Vernon R Pawelsky
- 👤 Lourdes V Mccarty
- 👤 William A Biermann
- 👤 John T Dulak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:36
CPC Classifications
G; G05; G05D; G05D9/00; G05D9/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1980789A
Cited
US2185978A
Cited
US2183854A
Cited
US2286137A
Cited
US2305429A
Cited
US2317063A
Cited
US2353498A
Cited
US2372436A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-08 | 1953-11-07 | 1954-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-08 | 1957-11-07 | 1958-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-08 | 1961-11-07 | 1962-05-09 | $7700.00 | Window Closed / Lapsed |