Patent US2878876A successfully refreshed from Google Patents.
US2878876A
Expired / Lapsed
US
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Well packing tool
Assignee: Johnston Testers Inc
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Filing: 1956-10-03
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Granted: 1959-03-24
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Expires: 1976-10-03
Abstract
No abstract record available.
Inventors
- 👤 Thomas L Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:08
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/128
Claims Analysis
Total Claims: 0
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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) | 1962-03-23 | 1962-09-22 | 1963-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-23 | 1966-09-22 | 1967-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-23 | 1970-09-22 | 1971-03-24 | $7700.00 | Window Closed / Lapsed |