Patent US3402769A successfully refreshed from Google Patents.
US3402769A
Expired / Lapsed
US
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Fracture detection method for bore holes
Assignee: Go Services Inc
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Filing: 1965-08-17
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Granted: 1968-09-24
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Expires: 1985-08-17
Abstract
No abstract record available.
Inventors
- 👤 Doggett Otto Glenn
- 👤 John R Seay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:45
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/02; E21B43/00; E21B43/25; E21B43/26; E21B47/10; E21B47/11; E21B47/111
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2316361A
Cited
US2686881A
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US2951535A
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US2952319A
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US3086760A
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US3075581A
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US3175608A
Cited
US3193010A
Cited
US3288210A
Cited
US3285335A
Cited
US3270816A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-24 | 1972-03-25 | 1972-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-24 | 1976-03-25 | 1976-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-24 | 1980-03-25 | 1980-09-24 | $7700.00 | Window Closed / Lapsed |