US3495854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High strength flush joint for oil well casing,or the like
Assignee: DONALD W FETHER
•
Filing: 1968-11-01
•
Granted: 1970-02-17
•
Expires: 1988-11-01
Abstract
No abstract record available.
Inventors
- 👤 Donald W Fether
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:17
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/08; Y; Y10; Y10T; Y10T403/00; Y10T403/36; Y10T403/364; Y10T403/368
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1320503A
Cited
US1849075A
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US2088763A
Cited
FR892856A
Cited
US2555256A
Cited
US2763923A
Cited
US2737710A
Cited
US3080179A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-16 | 1973-08-18 | 1974-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-16 | 1977-08-18 | 1978-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-16 | 1981-08-18 | 1982-02-17 | $7700.00 | Window Closed / Lapsed |