Patent US3052952A successfully refreshed from Google Patents.
Patent US2959600A successfully refreshed from Google Patents.
US2959600A
Expired / Lapsed
US
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Purification of maleic anhydride
Assignee: —
•
Filing: —
•
Granted: 1960-11-08
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Expires: 1977-11-08
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:46
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/54; C07C51/573; C07C51/16; C07C51/21; C07C51/215; C07C51/56; C07C57/00; C07C57/02; C07C57/13; C07C57/145; C07D; C07D307/00; C07D307/02; C07D307/34; C07D307/56; C07D307/60; C07D307/77; C07D307/87; C07D307/89
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
29 words
A PROCESS FOR PURIFYING MALEIC ANHYDRIDE PRODUCED BY THE OXIDATION OF BENZENE WHICH COMPRISES ADDING PARALDEHYDE TO SAID MALEIC ANHYDRIDE, BOILING THE RESULTING MIXTURE AND THEN DISTILLING SAID ANHYDRIDE.
Claim 2
Dependent Claim
29 words
A PROCESS FOR PURIFYING MALEIC ANHYDRIDE PRODUCED BY THE OXIDATION OF BENZENE WHICH COMPRISES ADDING PARALDEHYDE TO SAID MALEIC ANHYDRIDE, BOILING THE RESULTING MIXTURE AND THEN DISTILLING SAID ANHYDRIDE.
References Cited (Backward Citations)
US2518312A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-08 | 1964-05-09 | 1964-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-08 | 1968-05-09 | 1968-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-08 | 1972-05-09 | 1972-11-08 | $7700.00 | Window Closed / Lapsed |