Patent US2670508A successfully refreshed from Google Patents.
Patent US1845181A successfully refreshed from Google Patents.
US1845181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Head flowing fluid lift
Assignee: Individual
•
Filing: 1927-05-26
•
Granted: 1932-02-16
•
Expires: 1947-05-26
Abstract
No abstract record available.
Inventors
- 👤 Penrod John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:57
CPC Classifications
F; F04; F04F; F04F1/00; F04F1/06; E; E21; E21B; E21B43/00; E21B43/12; E21B43/121; E21B43/122
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1935-02-15 | 1935-08-17 | 1936-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-02-15 | 1939-08-17 | 1940-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-02-15 | 1943-08-17 | 1944-02-16 | $7700.00 | Window Closed / Lapsed |