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US3476841A
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Process for producing a foamed polystyrene product having a hard skin
Assignee: HERBERT F BIENERT
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Filing: 1966-09-06
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Granted: 1969-11-04
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Expires: 1986-09-06
Abstract
No abstract record available.
Inventors
- 👤 Herbert F Bienert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:43
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/34; B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/38; B29C44/44; B29C44/445; B29C33/00; B29C33/02; B29C33/04; B29K; B29K2025/00; B29K2105/00; B29K2105/04; B29K2105/043; C08J2325/00; C08J2325/02; C08J2325/04; C08J2325/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1659962A
Cited
US2787809A
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US2898632A
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US2908943A
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US2926389A
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US3243484A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-03 | 1973-05-05 | 1973-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-03 | 1977-05-05 | 1977-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-03 | 1981-05-05 | 1981-11-04 | $7700.00 | Window Closed / Lapsed |