US2569026A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well apparatus
Assignee: Individual
•
Filing: 1946-12-09
•
Granted: 1951-09-25
•
Expires: 1966-12-09
Abstract
No abstract record available.
Inventors
- 👤 Arnold P Springer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:24
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/124
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1100787A
Cited
US1180312A
Cited
US1992424A
Cited
US2326940A
Cited
US2466305A
Cited
US2308072A
Cited
US2493962A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-24 | 1955-03-26 | 1955-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-24 | 1959-03-26 | 1959-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-24 | 1963-03-26 | 1963-09-25 | $7700.00 | Window Closed / Lapsed |