US3463231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Generation and use of foamed well circulation fluids
Assignee: Chevron USA Inc
•
Filing: 1968-02-12
•
Granted: 1969-08-26
•
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 05:09
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/14; C; C09; C09K; C09K8/00; C09K8/58; C09K8/592
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3273643A
Cited
US3130798A
Cited
US3229777A
Cited
US3185634A
Cited
US3269468A
Cited
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 |