Patent US3490480A successfully refreshed from Google Patents.
US3490480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of drilling fluid properties
Assignee: Phillips Petroleum Co
•
Filing: 1966-08-19
•
Granted: 1970-01-20
•
Expires: 1986-08-19
Abstract
No abstract record available.
Inventors
- 👤 Edwin D Parsons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:17
CPC Classifications
G; G05; G05D; G05D11/00; G05D11/02; G05D11/13; G05D11/135; G05D11/136; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2499; Y10T137/2509
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2214674A
Cited
US2341169A
Cited
GB688642A
Cited
US2764465A
Cited
US2913386A
Cited
US2923151A
Cited
US2923355A
Cited
US2919898A
Cited
US3303895A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-19 | 1973-07-21 | 1974-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-19 | 1977-07-21 | 1978-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-19 | 1981-07-21 | 1982-01-20 | $7700.00 | Window Closed / Lapsed |