Patent US4419814A successfully refreshed from Google Patents.
Patent US3773828A successfully refreshed from Google Patents.
US3773828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of acrylic acid
Assignee: Individual
•
Filing: 1971-12-28
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Granted: 1973-11-20
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Expires: 1991-12-28
Abstract
Abstract AN A,B-UNSATURATED ALDEHYDE, E.G. ACROLEIN, IS SUBJECTED TO A VAPOR-PHASE CATALYTIC OXIDATION TO PRODUCE THE CORRESPONDING A,B-UNSATURATED CARBOXYLIC ACID, E.G. ACRYLIC ACID, IN THE PRESENCE OF AN OXIDATION CATALYST COMPRISING MOLYBDENUM, VANADIUM AND OXYGEN, WHICH CATALYST HAS BEEN PRODUCED THROUGH THE USE AS AT LEAST A PART OF A VANADIUM SOURCE OF VANADYL OXALATE IN AN AQUEOUS MEDIUM.
Inventors
- 👤 K Kadowaki
- 👤 T Koshikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:04
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |