US3639461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of alpha beta-unsaturated monocarboxylic acid esters
Assignee: Toagosei Co Ltd
•
Filing: 1968-07-31
•
Granted: 1972-02-01
•
Expires: 1988-07-31
Abstract
Abstract THE ALKYL ESTER OF AN A,B-UNSATURATED MONOCARBOXYLIC ACID, IS PREPARED BY THE VAPOR-PHASE ESTERIFICATION OF THE CORRESPONDING MONOCARBOXYLIC ACID AND AN ALIPHATIC MONOHYDRIC ALCOHOL HAVING FROM 1 TO 8 CARBON ATOMS IN THE PRESENCE OF A CATALYST, SUCH AS A TITANIUM OXIDE CATALYST, A TITANIUM-ANTIMONY-OXYGEN CATALYST, A TITANIUMSILICON-OXYGEN CATALYST, AND A TITANIUM-ANTIMONY-SILICONOXYGEN CATALYST.
Inventors
- 👤 Hiroo Ito
- 👤 Kaoru Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:17
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/52; C07C69/533; C07C69/54
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |