Patent US2644643A successfully refreshed from Google Patents.
US2644643A
Expired / Lapsed
US
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Laminated-ring and multiple internal-roll mill
Assignee: Foster Wheeler Inc
•
Filing: 1949-04-19
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Granted: 1953-07-07
•
Expires: 1969-04-19
Abstract
No abstract record available.
Inventors
- 👤 Frisch Martin
- 👤 Jr Gilbert C Whitney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:21
CPC Classifications
B; B02; B02C; B02C15/00; B02C15/06; B02C15/003; B02C2015/002
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |