US3328376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of polybutadiene
Assignee: Huels AG
•
Filing: 1964-09-23
•
Granted: 1967-06-27
•
Expires: 1984-09-23
Abstract
No abstract record available.
Inventors
- 👤 Bernemann Paul
- 👤 Engel Frederico
- 👤 Schafer Johannes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:06
CPC Classifications
C; C08; C08C; C08C19/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3161628A
Cited
US2977349A
Cited
US3086000A
Cited
US3066127A
Cited
GB905001A
Cited
US3111510A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-06-26 | 1970-12-26 | 1971-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-26 | 1974-12-26 | 1975-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-26 | 1978-12-26 | 1979-06-27 | $7700.00 | Window Closed / Lapsed |