US2481732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well head construction
Assignee: Individual
•
Filing: 1946-01-19
•
Granted: 1949-09-13
•
Expires: 1966-01-19
Abstract
No abstract record available.
Inventors
- 👤 Jack E Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:01
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04; E21B2200/00; E21B2200/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1561236A
Cited
US1620383A
Cited
US1973809A
Cited
US2023033A
Cited
US2073890A
Cited
US2228555A
Cited
US2312476A
Cited
US2380388A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-09-12 | 1953-03-14 | 1953-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-09-12 | 1957-03-14 | 1957-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-09-12 | 1961-03-14 | 1961-09-13 | $7700.00 | Window Closed / Lapsed |