US2791277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well packer
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1955-11-07
•
Granted: 1957-05-07
•
Expires: 1975-11-07
Abstract
No abstract record available.
Inventors
- 👤 William T Ilfrey
- 👤 Wilber F Hiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:37
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/122
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US627250A
Cited
US1318352A
Cited
US1014272A
Cited
US1202319A
Cited
US1871867A
Cited
US2253092A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-05-06 | 1960-11-05 | 1961-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-06 | 1964-11-05 | 1965-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-06 | 1968-11-05 | 1969-05-07 | $7700.00 | Window Closed / Lapsed |