US2993540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Packer for well bores
Assignee: Seismograph Service Corp
•
Filing: 1957-08-08
•
Granted: 1961-07-25
•
Expires: 1977-08-08
Abstract
No abstract record available.
Inventors
- 👤 Lloyd C Fons
- 👤 Robert M Macfarlane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:18
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/134
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1301285A
Cited
US1342927A
Cited
US1503693A
Cited
US2583316A
Cited
US2631672A
Cited
US2851112A
Cited
US2843052A
Cited
US2812025A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |