Patent US2321439A successfully refreshed from Google Patents.
US3379799A
Expired / Lapsed
US
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Method of making foamed plastics
Assignee: Papex Corp
•
Filing: 1965-10-20
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Granted: 1968-04-23
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Expires: 1985-10-20
Abstract
No abstract record available.
Inventors
- 👤 Goldman Conrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:44
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/32; Y; Y10; Y10S; Y10S521/00; Y10S521/915
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2354260A
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US2983692A
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US3154604A
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US2989782A
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US2962456A
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US3010157A
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US3057751A
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US3138478A
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US3086885A
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US3223518A
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US3253064A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-23 | 1971-10-23 | 1972-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-23 | 1975-10-23 | 1976-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-23 | 1979-10-23 | 1980-04-23 | $7700.00 | Window Closed / Lapsed |