US3438870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the continuous recovery of vinyl esters and carboxylic acids by azeotropic distillation
Assignee: Hoechst AG
•
Filing: 1967-12-19
•
Granted: 1969-04-15
•
Expires: 1987-12-19
Abstract
No abstract record available.
Inventors
- 👤 Gunter Roscher
- 👤 Klaus Gunther
- 👤 Otto Probst
- 👤 Jorg Scholderer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:29
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/04; C07C67/05; C07C67/055; C07C51/00; C07C51/42; C07C51/43; C07C51/44; C07C51/46; C07C67/48; C07C67/52; C07C67/54
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2997495A
Cited
US3113851A
Cited
US3052610A
Cited
US3277158A
Cited
US3346626A
Cited
US3290362A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |