Patent US3463231A successfully refreshed from Google Patents.
US3463231A
Expired / Lapsed
US
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Generation and use of foamed well circulation fluids
Assignee: Chevron USA Inc
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Filing: 1968-02-12
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Granted: 1969-08-26
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Expires: 1988-02-12
Abstract
No abstract record available.
Inventors
- 👤 Stanley O Hutchison
- 👤 Glen W Anderson
- 👤 John C Mckinnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:11
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/14; C; C09; C09K; C09K8/00; C09K8/58; C09K8/592
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3273643A
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US3130798A
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US3229777A
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US3185634A
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US3269468A
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US3221813A
Cited
US3330346A
Cited
US3313362A
Cited
US3391750A
Cited
US3373805A
Cited
US3412793A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-25 | 1973-02-24 | 1973-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-25 | 1977-02-24 | 1977-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-25 | 1981-02-24 | 1981-08-26 | $7700.00 | Window Closed / Lapsed |