US3486560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ammoniated foamed well circulation fluids and uses thereof
Assignee: Chevron USA Inc
•
Filing: 1968-04-12
•
Granted: 1969-12-30
•
Expires: 1988-04-12
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
2026-10-27 12:52
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/14; C; C09; C09K; C09K8/00; C09K8/52
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3136361A
Cited
US3130798A
Cited
US3269468A
Cited
US3323593A
Cited
US3330346A
Cited
US3313362A
Cited
US3391750A
Cited
US3410344A
Cited
US3392782A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-29 | 1973-06-30 | 1973-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-29 | 1977-06-30 | 1977-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-29 | 1981-06-30 | 1981-12-30 | $7700.00 | Window Closed / Lapsed |