Patent US2766481A successfully refreshed from Google Patents.
US2766481A
Expired / Lapsed
US
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Methods of and apparatus for extruding cellular plastics
Assignee: AT&T Inc
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Filing: 1952-08-28
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Granted: 1956-10-16
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Expires: 1972-08-28
Abstract
No abstract record available.
Inventors
- 👤 George E Henning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:08
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/20; B29; B29C; B29C44/00; B29C44/20; B29C44/32; B29C44/322; B29C44/34; B29C44/36; B29C44/46; B29C44/50; B29C44/507
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US326021A
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US2345086A
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US2156508A
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US2199209A
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US2354260A
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US2455509A
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US2512506A
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US2496625A
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US2450436A
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US2537977A
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US2581769A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-16 | 1960-04-16 | 1960-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-16 | 1964-04-16 | 1964-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-16 | 1968-04-16 | 1968-10-16 | $7700.00 | Window Closed / Lapsed |