US2528537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System electrically responsive to change in level of material in a receptacle
Assignee: Houdry Process Corp
•
Filing: 1947-01-02
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Granted: 1950-11-07
•
Expires: 1967-01-02
Abstract
No abstract record available.
Inventors
- 👤 Harmon J Monnik
- 👤 Harold H Eickhoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:53
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/24; G01F23/246
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB129741A
Cited
US1942241A
Cited
FR822247A
Cited
GB513427A
Cited
US2262070A
Cited
US2246563A
Cited
US2394928A
Cited
US2382755A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-06 | 1954-05-08 | 1954-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-06 | 1958-05-08 | 1958-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-06 | 1962-05-08 | 1962-11-07 | $7700.00 | Window Closed / Lapsed |