Patent US5423824A successfully refreshed from Google Patents.
US3260318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well drilling apparatus
Assignee: Smith Industries International Inc
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Filing: 1963-11-12
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Granted: 1966-07-12
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Expires: 1983-11-12
Abstract
No abstract record available.
Inventors
- 👤 William J Neilson
- 👤 Erskine P Garrison
- 👤 Gayle D Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:20
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/02
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) | 1969-07-11 | 1970-01-10 | 1970-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-11 | 1974-01-10 | 1974-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-11 | 1978-01-10 | 1978-07-12 | $7700.00 | Window Closed / Lapsed |