US2848052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for vertical fracturing
Assignee: Phillips Petroleum Co
•
Filing: 1954-11-19
•
Granted: 1958-08-19
•
Expires: 1974-11-19
Abstract
No abstract record available.
Inventors
- 👤 Donald L Stinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:08
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/25; E21B43/26
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1523286A
Cited
US1828381A
Cited
DE623870C
Cited
FR756396A
Cited
US2314540A
Cited
US2479394A
Cited
US2504462A
Cited
US2687179A
Cited
US2642142A
Cited
US2596844A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-18 | 1962-02-17 | 1962-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-18 | 1966-02-17 | 1966-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-18 | 1970-02-17 | 1970-08-19 | $7700.00 | Window Closed / Lapsed |