Patent US2575159A successfully refreshed from Google Patents.
US2575159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing
Assignee: —
•
Filing: —
•
Granted: 1951-11-13
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Expires: 1968-11-13
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:15
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/23; C07C51/235; C07C63/00; C07C63/14; C07C63/15; C07C63/16; C07D; C07D307/00; C07D307/77; C07D307/87; C07D307/89
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A PROCESS FOR THE PRODUCTION OF SATURATED FATTY ACID ANHYDRIDES HAVING FROM FOUR TO EIGHT CARBON ATOMS WHICH COMPRISES, INTRODUCING AN ALDEHYDE CAPABLE OF GENERATING SAID ANHYDRIDE, AND AN OXYGEN-CONTAINING GAS, INTO A BATH SUBSTANTIALLY CONSISTING OF AT LEAST 75% BY WEIGHT OF THE DESIRED ANHYDRIDE, ITS CORRESPONDING ACID AND A CATALYST WHICH CONSISTS OF AT LEAST ONE SALT OF A METAL SELECTED FROM THE GROUP CONSISTING OF VANADIUM, COBALT, NICKEL, COPPER AND SILVER, COMBINED WITH THE ACID CORRESPONDING TO THE DESIRED ANHYDRIDE, SAID BATH BEING MAINTAINED AT A TEMPERATURE OF FROM ABOUT 30* C. TO ABOUT 100* C., AND REMOVING GAS CONTAINING THE DESIRED ANHYDRIDE FROM THE BATH.
Claim 2
Dependent Claim
109 words
A PROCESS FOR THE PRODUCTION OF SATURATED FATTY ACID ANHYDRIDES HAVING FROM FOUR TO EIGHT CARBON ATOMS WHICH COMPRISES, INTRODUCING AN ALDEHYDE CAPABLE OF GENERATING SAID ANHYDRIDE, AND AN OXYGEN-CONTAINING GAS, INTO A BATH SUBSTANTIALLY CONSISTING OF AT LEAST 75% BY WEIGHT OF THE DESIRED ANHYDRIDE, ITS CORRESPONDING ACID AND A CATALYST WHICH CONSISTS OF AT LEAST ONE SALT OF A METAL SELECTED FROM THE GROUP CONSISTING OF VANADIUM, COBALT, NICKEL, COPPER AND SILVER, COMBINED WITH THE ACID CORRESPONDING TO THE DESIRED ANHYDRIDE, SAID BATH BEING MAINTAINED AT A TEMPERATURE OF FROM ABOUT 30* C. TO ABOUT 100* C., AND REMOVING GAS CONTAINING THE DESIRED ANHYDRIDE FROM THE BATH.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-12 | 1955-05-14 | 1955-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-12 | 1959-05-14 | 1959-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-12 | 1963-05-14 | 1963-11-13 | $7700.00 | Window Closed / Lapsed |