US2570977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Level control system
Assignee: Baker Petrolite LLC
•
Filing: 1948-03-05
•
Granted: 1951-10-09
•
Expires: 1968-03-05
Abstract
No abstract record available.
Inventors
- 👤 Robert L Pettefer
- 👤 Jr George M Badger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:46
CPC Classifications
G; G05; G05D; G05D9/00; G05D9/04; B; B01; B01D; B01D17/00; B01D17/02; B01D17/0208; B01D17/0214
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1722160A
Cited
US2025883A
Cited
US2021655A
Cited
US2072206A
Cited
US2119348A
Cited
US2216977A
Cited
US2338986A
Cited
US2377565A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-08 | 1955-04-09 | 1955-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-08 | 1959-04-09 | 1959-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-08 | 1963-04-09 | 1963-10-09 | $7700.00 | Window Closed / Lapsed |