US2872226A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stop collar for a well pipe
Assignee: B&W Inc
•
Filing: 1955-12-02
•
Granted: 1959-02-03
•
Expires: 1975-12-02
Abstract
No abstract record available.
Inventors
- 👤 Kenneth A Wright
- 👤 James R Solum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:47
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1014; E21B17/1021; E21B17/1028; E21B37/00; E21B37/02; Y; Y10; Y10T; Y10T403/00; Y10T403/70; Y10T403/7047; Y10T403/7049
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US465202A
Cited
US1997649A
Cited
US2454557A
Cited
US2499104A
Cited
US2546582A
Cited
US2718266A
Cited
US2636564A
Cited
US2801700A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-02 | 1962-08-04 | 1963-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-02 | 1966-08-04 | 1967-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-02 | 1970-08-04 | 1971-02-03 | $7700.00 | Window Closed / Lapsed |