Patent US3374300A successfully refreshed from Google Patents.
US3374300A
Expired / Lapsed
US
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Process and apparatus for the continuous production of polystyrenic foam materials
Assignee: Individual
•
Filing: 1964-07-06
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Granted: 1968-03-19
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Expires: 1984-07-06
Abstract
No abstract record available.
Inventors
- 👤 Azuma Kimikazu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:11
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/468
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1980898A
Cited
US2350996A
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US2437460A
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DE842402C
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US2669751A
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US2655196A
Cited
US2740157A
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US2836851A
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US2874408A
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US3094449A
Cited
US3121130A
Cited
US3160688A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-19 | 1971-09-18 | 1972-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-19 | 1975-09-18 | 1976-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-19 | 1979-09-18 | 1980-03-19 | $7700.00 | Window Closed / Lapsed |