US3520186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic fluid interface sensing
Assignee: Emerson Electric Co
•
Filing: 1968-03-11
•
Granted: 1970-07-14
•
Expires: 1988-03-11
Abstract
No abstract record available.
Inventors
- 👤 George Leslie Adams
- 👤 Irwin S Landow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:51
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/28; G01F23/296; G01F23/2966; G01F23/2967
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2960678A
Cited
GB809681A
Cited
US2990543A
Cited
GB813497A
Cited
US3010318A
Cited
US3213438A
Cited
US3214974A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-13 | 1974-01-12 | 1974-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-13 | 1978-01-12 | 1978-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-13 | 1982-01-12 | 1982-07-14 | $7700.00 | Window Closed / Lapsed |