US3542142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of drilling and drill bit therefor
Assignee: Gulf Research and Development Co
•
Filing: 1968-09-27
•
Granted: 1970-11-24
•
Expires: 1988-09-27
Abstract
No abstract record available.
Inventors
- 👤 Horst H Hasiba
- 👤 Joseph H Messmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:11
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/60; E21B7/00; E21B7/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-23 | 1974-05-25 | 1974-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-23 | 1978-05-25 | 1978-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-23 | 1982-05-25 | 1982-11-24 | $7700.00 | Window Closed / Lapsed |