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Patent US3509764A successfully refreshed from Google Patents.
US3509764A
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Method of investigating well blast impingement conditions
Assignee: Mobil Oil AS
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Filing: 1968-07-05
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Granted: 1970-05-05
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Expires: 1988-07-05
Abstract
No abstract record available.
Inventors
- 👤 Willett F Baldwin
- 👤 Wayne E Mcneely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:45
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/10; E21B47/107
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2210417A
Cited
US2396935A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-04 | 1973-11-03 | 1974-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-04 | 1977-11-03 | 1978-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-04 | 1981-11-03 | 1982-05-05 | $7700.00 | Window Closed / Lapsed |