US3000444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centralizer
Assignee: B&W Inc
•
Filing: 1957-11-05
•
Granted: 1961-09-19
•
Expires: 1977-11-05
Abstract
No abstract record available.
Inventors
- 👤 Kenneth A Wright
- 👤 James R Solum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:23
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1014; E21B17/1021; E21B17/1028
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1775376A
Cited
US2311768A
Cited
US2680488A
Cited
US2640544A
Cited
US2605844A
Cited
US2727576A
Cited
US2845128A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |