Patent US2179069A successfully refreshed from Google Patents.
US3408263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single column distillation of mixture of aromatics containing styrene
Assignee: Universal Oil Products Co
•
Filing: 1966-11-22
•
Granted: 1968-10-29
•
Expires: 1986-11-22
Abstract
No abstract record available.
Inventors
- 👤 Dennis J Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:15
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; Y; Y10; Y10S; Y10S203/00; Y10S203/19
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
CA515494A
Cited
US2240764A
Cited
US2336493A
Cited
US2370948A
Cited
US2411106A
Cited
US2557684A
Cited
US2556030A
Cited
US3084108A
Cited
US3209044A
Cited
US3219721A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |