Patent US2548616A successfully refreshed from Google Patents.
US2548616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well drilling
Assignee: Individual
•
Filing: 1948-02-02
•
Granted: 1951-04-10
•
Expires: 1968-02-02
Abstract
No abstract record available.
Inventors
- 👤 Priestman George Dawson
- 👤 Priestman Gerald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:42
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/20; E21B19/00; E21B19/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US287444A
Cited
DE421562C
Cited
US1245274A
Cited
US2336338A
Cited
US2056471A
Cited
US2013070A
Cited
US2292126A
Cited
US2453038A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-09 | 1954-10-09 | 1955-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-09 | 1958-10-09 | 1959-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-09 | 1962-10-09 | 1963-04-10 | $7700.00 | Window Closed / Lapsed |