US2764178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic control of liquid levels in vessels
Assignee: Ruhrchemie AG
•
Filing: 1951-09-19
•
Granted: 1956-09-25
•
Expires: 1971-09-19
Abstract
No abstract record available.
Inventors
- 👤 Paul Herbert
- 👤 List Theodor Van Der
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:58
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/28; G01F23/284; G01F23/292; G01F23/2921; F; F22; F22D; F22D5/00; F22D5/24; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7358; Y10T137/7368; Y10T137/8158; Y10T137/8342
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190827973A
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US1455795A
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US1678884A
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US2091303A
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US1924139A
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US2149735A
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US2358103A
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US2490627A
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US2654858A
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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) | 1959-09-25 | 1960-03-26 | 1960-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-25 | 1964-03-26 | 1964-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-25 | 1968-03-26 | 1968-09-25 | $7700.00 | Window Closed / Lapsed |