US3423385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for purifying butadiene stream
Assignee: Bridgestone Firestone Inc
•
Filing: 1964-09-18
•
Granted: 1969-01-21
•
Expires: 1984-09-18
Abstract
No abstract record available.
Inventors
- 👤 Robert L Bebb
- 👤 Edward L Kay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:32
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/005; C07C7/148; C07C7/14833; C07C7/1485
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1151928A
Cited
GB570650A
Cited
US2543478A
Cited
US3209050A
Cited
DE1196641B
Cited
US3281489A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |