Patent US3558692A successfully refreshed from Google Patents.
US3558692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of vinyl acetate from ethylene
Assignee: EIDP Inc
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Filing: 1964-02-17
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Granted: 1971-01-26
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Expires: 1984-02-17
Abstract
Abstract A CYCLIC TWO-STAGE METHOD OF PREPARING VINYL ACETATE WHICH COMPRISES REACTING IN A FIRST STAGE ETHYLENE WITH A WORKING SOLUTION WHICH IN ITS OXIDIZED STATE IS AN ACETATE ACID SOLUTION INCLUDING A CUPRIC SALT, A PALLADIUM II SALT AND CHLORIDE OR BROMIDE IONS WITHIN CERTAIN CRITICAL CONCENTRATION LIMITS AND CONTACTING IN A SECOND STAGE THE REDUCED WORKING SOLUTION FROM THE FIRST STAGE WITH OXYGEN IN A REACTION ZONE WHEREIN BACK-MIXING OF THE WORKING SOLUTION IS EFFECTED.
Inventors
- 👤 Harry B Copelin
- 👤 Melvin J Freamo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:17
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/04; C07C67/05; C07C67/055
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |