US2423653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for developing wells
Assignee: Individual
•
Filing: 1943-08-03
•
Granted: 1947-07-08
•
Expires: 1963-08-03
Abstract
No abstract record available.
Inventors
- 👤 Herman E Lauman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:50
CPC Classifications
E; E21; E21B; E21B37/00; E21B37/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1235770A
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US1289320A
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US1379815A
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US1484601A
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US1774640A
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US2014770A
Cited
US2213987A
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US2318167A
Cited
US2259262A
Cited
US2309697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-07-07 | 1951-01-06 | 1951-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-07 | 1955-01-06 | 1955-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-07 | 1959-01-06 | 1959-07-08 | $7700.00 | Window Closed / Lapsed |