US3579574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of acrylic acid
Assignee: Distillers Co Yeast Ltd
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Filing: 1965-01-22
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Granted: 1971-05-18
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Expires: 1985-01-22
Abstract
Abstract ACRYLIC ACID IS PREPARED BY THE VAPOR PHASE OXIDATION OF PROPYLENE OR ACROLEIN WITH OXYGEN IN THE PRESENCE OF A CATALYST CONSISTING ESSENTIALLY OF AN OXIDE COMPOSITION CONTAINING ANTIMONY AND VANADIUM OR ANTIMONY, VANADIUM AND AT LEAST ONE POLYVALENT METAL SELECTED FROM THE GROUP OF IRON, MANGANESE, CHROMIUM, COBALT, NICKEL, COPPER, ZINC, CADMIUNM, TUNGSTEN AND THORIUM, THE CATALYST BEING HEATED TO A TEMPERATURE ABOVE 700* TO ABOUT 900* C. IN MOLECULAR OXYGEN GAS BEFORE USE.
Inventors
- 👤 Wilhelmus Teunis Van Der Meer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:59
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252; B; B01; B01J; B01J23/00; B01J23/002; B01J23/16; B01J23/18; B01J23/20; B01J23/22; B01J23/24; B01J23/26; B01J23/28; B01J23/32; B01J23/34; B01J23/70; B01J23/76; B01J23/84; B01J23/843; B01J23/8435; B01J23/847; B01J23/8472; B01J2523/00
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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |