US2833816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of aromatic polycarboxylic acids
Assignee: Mid Century Corp
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Filing: 1955-08-24
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Granted: 1958-05-06
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Expires: 1975-08-24
Abstract
No abstract record available.
Inventors
- 👤 Saffer Alfred
- 👤 Robert S Barker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:32
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/255; C07C51/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A PROCESS FOR PRODUCING A POLYCARBOXYLIC AROMATIC ACID WHICH COMPRISES REACTING IN A REACTION ZONE, WHILE MAINTAINING A LIQUID PHASE IN SAID ZONE, AN AROMATIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF POLYALKYL AROMATIC COMPOUNDS AND INTERMEDIATE OXYGENATED DERIVATIVES THEREOF WITH MOLECULAR OXYGEN IN THE PRESENCE OF A CATALYST COMPRISING IN CONJOINT PRESENCE BROMINE AND A HEAVY METAL OXIDATION CATALYST AND RECOVERING SAID POLYCARBOXYLIC AROMATIC ACID.
Claim 2
Dependent Claim
66 words
A PROCESS FOR PRODUCING A POLYCARBOXYLIC AROMATIC ACID WHICH COMPRISES REACTING IN A REACTION ZONE, WHILE MAINTAINING A LIQUID PHASE IN SAID ZONE, AN AROMATIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF POLYALKYL AROMATIC COMPOUNDS AND INTERMEDIATE OXYGENATED DERIVATIVES THEREOF WITH MOLECULAR OXYGEN IN THE PRESENCE OF A CATALYST COMPRISING IN CONJOINT PRESENCE BROMINE AND A HEAVY METAL OXIDATION CATALYST AND RECOVERING SAID POLYCARBOXYLIC AROMATIC ACID.
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) | 1961-05-05 | 1961-11-04 | 1962-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-05 | 1965-11-04 | 1966-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-05 | 1969-11-04 | 1970-05-06 | $7700.00 | Window Closed / Lapsed |