Patent US2398172A successfully refreshed from Google Patents.
US2398172A
Expired / Lapsed
US
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Winding of spiral fins
Assignee: Griscom Russell Co
•
Filing: 1944-05-11
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Granted: 1946-04-09
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Expires: 1964-05-11
Abstract
No abstract record available.
Inventors
- 👤 Bruegger Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:50
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/22; B21C37/26; B21F; B21F3/00; B21F3/02; B21F3/04; Y; Y10; Y10S; Y10S72/00; Y10S72/701
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1949-04-08 | 1949-10-08 | 1950-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-04-08 | 1953-10-08 | 1954-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-04-08 | 1957-10-08 | 1958-04-09 | $7700.00 | Window Closed / Lapsed |