Patent US3489040A successfully refreshed from Google Patents.
US3489040A
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Method of deep bore drilling
Assignee: DONALD R WESTHOFF
•
Filing: 1967-08-23
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Granted: 1970-01-13
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Expires: 1987-08-23
Abstract
No abstract record available.
Inventors
- 👤 Donald R Westhoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:28
CPC Classifications
B; B23; B23B; B23B41/00; B23B41/02; B23B41/14; Y; Y10; Y10T; Y10T408/00; Y10T408/03; Y10T408/47
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2343164A
Cited
US2488620A
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GB694632A
Cited
US2824470A
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US2908978A
Cited
US3045727A
Cited
CH369002A
Cited
US3158043A
Cited
US3416580A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |