US2859943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansible mill for well casings
Assignee: Individual
•
Filing: 1957-01-07
•
Granted: 1958-11-11
•
Expires: 1977-01-07
Abstract
No abstract record available.
Inventors
- 👤 Chadderdon Jack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:39
CPC Classifications
E; E21; E21B; E21B29/00; E21B29/002; E21B29/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-10 | 1962-05-12 | 1962-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-10 | 1966-05-12 | 1966-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-10 | 1970-05-12 | 1970-11-11 | $7700.00 | Window Closed / Lapsed |