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Patent US2473230A successfully refreshed from Google Patents.
US2473230A
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Extrusion apparatus
Assignee: JOHN ROYLE AND SONS
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Filing: 1945-10-08
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Granted: 1949-06-14
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Expires: 1965-10-08
Abstract
No abstract record available.
Inventors
- 👤 Jurian W Van Riper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:15
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/505; B29C48/59; B29C48/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1375623A
Cited
US1684254A
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US1886592A
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US1951427A
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US2009734A
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US2370952A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-13 | 1952-12-13 | 1953-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-13 | 1956-12-13 | 1957-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-13 | 1960-12-13 | 1961-06-14 | $7700.00 | Window Closed / Lapsed |