Patent NL33915C successfully refreshed from Google Patents.
Patent US3440686A successfully refreshed from Google Patents.
US3440686A
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US
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Extrusion die having angularly moving central mandrel
Assignee: Millennium Petrochemicals Inc
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Filing: 1966-12-29
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Granted: 1969-04-29
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Expires: 1986-12-29
Abstract
No abstract record available.
Inventors
- 👤 Herbert O Corbett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:46
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/32; B29C48/335; B29C48/03; B29C48/09; B29C48/10; B29C48/14; B29C48/147; B29C48/1472; B29C48/16; B29C48/18; B29C48/21; B29C48/33; B29C2791/00; B29C2791/004; B29C2791/007
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1677808A
Cited
US2896254A
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US2801441A
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US2919467A
Cited
US2957201A
Cited
GB987809A
Cited
US3349437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-28 | 1972-10-28 | 1973-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-28 | 1976-10-28 | 1977-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-28 | 1980-10-28 | 1981-04-29 | $7700.00 | Window Closed / Lapsed |