US2981841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid level monitor system
Assignee: Robertshaw Controls Co
•
Filing: 1957-08-12
•
Granted: 1961-04-25
•
Expires: 1977-08-12
Abstract
No abstract record available.
Inventors
- 👤 Ross W Wheeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:03
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/24; G01F23/245; G01F23/28; G01F23/284; G01F23/288; G05; G05D; G05D9/00; G05D9/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2734136A
Cited
US2433718A
Cited
US2641034A
Cited
US2714167A
Cited
GB703712A
Cited
GB734873A
Cited
US2722609A
Cited
US2737592A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |