US2807439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coring device
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1955-03-16
•
Granted: 1957-09-24
•
Expires: 1975-03-16
Abstract
No abstract record available.
Inventors
- 👤 Lindsey I Lipscomb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:02
CPC Classifications
E; E21; E21B; E21B25/00; E21B25/18; E21B7/00; E21B7/12; E21B7/124; Y; Y10; Y10S; Y10S173/00; Y10S173/01; Y10T; Y10T83/00; Y10T83/929; Y10T83/9314
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |