Patent US2970169A successfully refreshed from Google Patents.
US2970169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polybasic aromatic acids
Assignee: Standard Oil Co
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Filing: 1955-08-25
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Granted: 1961-01-31
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Expires: 1975-08-25
Abstract
No abstract record available.
Inventors
- 👤 Herbert N Friedlander
- 👤 Richard H Baldwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:22
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/27; C07C51/275
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A PROCESS FOR THE PRODUCTION OF POLYBASIC AROMATIC ACIDS BY OXIDATION OF AN ALKYL SUBSTITUTED AROMATIC FEED STOCK WHICH COMPRISES CIRCULATING A STREAM OF DILUTE NITRIC ACID THROUGH A REACTION ZONE TO A SEPARATION ZONE, INJECTING THE FEED STOCK INTO THE CIRCULATING STREAM IN THE REACTION ZONE AT A CONTROLLED RATE MAINTAINING A RATIO OF NITRIC ACID TO FEED IN EXCESS OF 50 MOLS OF HNO3 PER MOL OF FEED, MAINTAINING A TEMPERATURE OF ABOUT 100* TO 300* C. AND A PRESSURE OF ABOUT 100 TO 1000 P.S.I.G. IN THE REACTION ZONE, SEPARATING POLYBASIC ACID PRODUCT FROM THE EFFUENT ACID STREAM FROM THE REACTION ZONE, RECIRCULATING THE SEPARATED NITRIC ACID FRACTION TO THE REACTION ZONE AND MAINTAINING THE CONCENTRATION OF THE NITRIC ACID
Claim 2
Dependent Claim
123 words
A PROCESS FOR THE PRODUCTION OF POLYBASIC AROMATIC ACIDS BY OXIDATION OF AN ALKYL SUBSTITUTED AROMATIC FEED STOCK WHICH COMPRISES CIRCULATING A STREAM OF DILUTE NITRIC ACID THROUGH A REACTION ZONE TO A SEPARATION ZONE, INJECTING THE FEED STOCK INTO THE CIRCULATING STREAM IN THE REACTION ZONE AT A CONTROLLED RATE MAINTAINING A RATIO OF NITRIC ACID TO FEED IN EXCESS OF 50 MOLS OF HNO3 PER MOL OF FEED, MAINTAINING A TEMPERATURE OF ABOUT 100* TO 300* C. AND A PRESSURE OF ABOUT 100 TO 1000 P.S.I.G. IN THE REACTION ZONE, SEPARATING POLYBASIC ACID PRODUCT FROM THE EFFUENT ACID STREAM FROM THE REACTION ZONE, RECIRCULATING THE SEPARATED NITRIC ACID FRACTION TO THE REACTION ZONE AND MAINTAINING THE CONCENTRATION OF THE NITRIC 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) | 1964-01-31 | 1964-08-01 | 1965-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-31 | 1968-08-01 | 1969-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-31 | 1972-08-01 | 1973-01-31 | $7700.00 | Window Closed / Lapsed |