US3476841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing a foamed polystyrene product having a hard skin
Assignee: HERBERT F BIENERT
•
Filing: 1966-09-06
•
Granted: 1969-11-04
•
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 12:09
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
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1659962A
Cited
US2787809A
Cited
US2898632A
Cited
US2908943A
Cited
US2926389A
Cited
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 |