US2315921A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well packer apparatus
Assignee: Baker Hughes Oilfield Operations LLC
•
Filing: 1940-03-18
•
Granted: 1943-04-06
•
Expires: 1960-03-18
Abstract
No abstract record available.
Inventors
- 👤 Reuben C Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:28
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/02; E21B43/10; E21B33/00; E21B33/10; E21B33/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1946-04-05 | 1946-10-05 | 1947-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-04-05 | 1950-10-05 | 1951-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-04-05 | 1954-10-05 | 1955-04-06 | $7700.00 | Window Closed / Lapsed |