US2426743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circulating well head
Assignee: OIL CENTER TOOL CO
•
Filing: 1943-06-24
•
Granted: 1947-09-02
•
Expires: 1963-06-24
Abstract
No abstract record available.
Inventors
- 👤 Arthur J Penick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:31
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US859060A
Cited
US1719207A
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US2150887A
Cited
US2213503A
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US2178700A
Cited
US2241288A
Cited
US2354929A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-09-01 | 1951-03-03 | 1951-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-01 | 1955-03-03 | 1955-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-01 | 1959-03-03 | 1959-09-02 | $7700.00 | Window Closed / Lapsed |