US3455137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tube extrusion apparatus and method
Assignee: Babcock and Wilcox Co
•
Filing: 1966-11-30
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Granted: 1969-07-15
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Expires: 1986-11-30
Abstract
No abstract record available.
Inventors
- 👤 David A Edgecombe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:37
CPC Classifications
B; B21; B21C; B21C29/00; B21C29/04; B21C23/00; B21C23/02; B21C23/04; B21C23/08; B21C23/085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2036182A
Cited
US2231761A
Cited
US2698683A
Cited
US2866545A
Cited
US2950816A
Cited
US2983373A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-14 | 1973-01-13 | 1973-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-14 | 1977-01-13 | 1977-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-14 | 1981-01-13 | 1981-07-15 | $7700.00 | Window Closed / Lapsed |