US2562833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dull bit indicator
Assignee: Standard Oil Development Co
•
Filing: 1948-12-22
•
Granted: 1951-07-31
•
Expires: 1968-12-22
Abstract
No abstract record available.
Inventors
- 👤 Martin E True
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:43
CPC Classifications
E; E21; E21B; E21B12/00; E21B12/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE201888C
Cited
US2226655A
Cited
US2296183A
Cited
US2468905A
Cited
US2457960A
Cited
US2489687A
Cited
US2461164A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-30 | 1955-01-29 | 1955-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-30 | 1959-01-29 | 1959-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-30 | 1963-01-29 | 1963-07-31 | $7700.00 | Window Closed / Lapsed |