Patent US3469642A successfully refreshed from Google Patents.
US3469642A
Expired / Lapsed
US
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Hydraulic drilling bit and nozzle
Assignee: Gulf Research and Development Co
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Filing: 1968-10-15
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Granted: 1969-09-30
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Expires: 1988-10-15
Abstract
No abstract record available.
Inventors
- 👤 Robert J Goodwin
- 👤 Joseph L Pekarek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:29
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/60; E21B10/61; B; B05; B05B; B05B1/00; B05B1/02; B05B1/10; E21B7/00; E21B7/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1104965A
Cited
US2583726A
Cited
US3112800A
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US3066735A
Cited
US3178121A
Cited
US3300142A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-29 | 1973-03-31 | 1973-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-29 | 1977-03-31 | 1977-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-29 | 1981-03-31 | 1981-09-30 | $7700.00 | Window Closed / Lapsed |