Patent US4617157A successfully refreshed from Google Patents.
US3389752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zone protection
Assignee: Schlumberger Technology Corp
•
Filing: 1965-10-23
•
Granted: 1968-06-25
•
Expires: 1985-10-23
Abstract
No abstract record available.
Inventors
- 👤 Maurice P Lebourg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:00
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/06; E21B23/00; E21B23/04; E21B23/042; E21B33/00; E21B33/10; E21B33/13; E21B33/134; E21B43/00; E21B43/02; E21B43/10; E21B43/103; E21B43/105; E21B43/11; E21B43/116
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US341327A
Cited
US1233888A
Cited
US1880218A
Cited
US2583316A
Cited
US2796134A
Cited
US2812025A
Cited
US3067819A
Cited
US3167122A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-25 | 1971-12-25 | 1972-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-25 | 1975-12-25 | 1976-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-25 | 1979-12-25 | 1980-06-25 | $7700.00 | Window Closed / Lapsed |