US3016099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hole enlarger
Assignee: TERMINAL DRILLING AND PRODUCTI
•
Filing: 1959-07-17
•
Granted: 1962-01-09
•
Expires: 1979-07-17
Abstract
No abstract record available.
Inventors
- 👤 Woodruff Charles Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:48
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/26; E21B10/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1733311A
Cited
US1909925A
Cited
US2103583A
Cited
US2104823A
Cited
US2203998A
Cited
US2201570A
Cited
US2238998A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-01-08 | 1965-07-10 | 1966-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-08 | 1969-07-10 | 1970-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-08 | 1973-07-10 | 1974-01-09 | $7700.00 | Window Closed / Lapsed |