US1905592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control device for wells
Assignee: Phillips Petroleum Co
•
Filing: 1932-01-30
•
Granted: 1933-04-25
•
Expires: 1952-01-30
Abstract
No abstract record available.
Inventors
- 👤 Donald R Knowlton
- 👤 Wilbur J Crites
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:06
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B34/00; E21B34/02; E21B34/025
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) | 1936-04-24 | 1936-10-24 | 1937-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-04-24 | 1940-10-24 | 1941-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-04-24 | 1944-10-24 | 1945-04-25 | $7700.00 | Window Closed / Lapsed |