US2740609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the removal of cuttings from drill holes
Assignee: Individual
•
Filing: 1952-03-06
•
Granted: 1956-04-03
•
Expires: 1972-03-06
Abstract
No abstract record available.
Inventors
- 👤 Allan S Richardson
- 👤 William C Williamson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:54
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/06; E21B21/07; Y; Y10; Y10S; Y10S261/00; Y10S261/54
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) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |