US2033563A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for controlling well flow
Assignee: TECHNICRAFT ENGINEERING Corp
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Filing: 1934-08-25
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Granted: 1936-03-10
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Expires: 1954-08-25
Abstract
No abstract record available.
Inventors
- 👤 Walter T Wells
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:48
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/14; E21B34/10; E21B43/00; E21B43/12; E21B2200/00; E21B2200/02
Claims Analysis
Total Claims: 0
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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) | 1939-03-10 | 1939-09-09 | 1940-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-03-10 | 1943-09-09 | 1944-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-03-10 | 1947-09-09 | 1948-03-10 | $7700.00 | Window Closed / Lapsed |