US2639464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion apparatus
Assignee: National Rubber Machinery Co
•
Filing: 1950-01-03
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Granted: 1953-05-26
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Expires: 1970-01-03
Abstract
No abstract record available.
Inventors
- 👤 Wilhelm A Magerkurth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:52
CPC Classifications
B; B28; B28B; B28B3/00; B28B3/20; B28B3/22; B29; B29C; B29C48/00; B29C48/03; B29C48/25; B29C48/36; B29C48/395; B29C48/50; B29C48/505; B29C48/56; B29C48/68; B29C48/685; B29C48/686
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1904884A
Cited
US869307A
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US1849291A
Cited
US2200997A
Cited
US2242364A
Cited
US2574151A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |