Patent US3309289A successfully refreshed from Google Patents.
US3309289A
Expired / Lapsed
US
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Recovery of benzoic acid by distillation in presence of excess water
Assignee: SNIA Viscosa SpA
•
Filing: 1962-10-08
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Granted: 1967-03-14
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Expires: 1982-10-08
Abstract
No abstract record available.
Inventors
- 👤 Messina Giuseppe
- 👤 Muench Werner
- 👤 Mattone Roberto
- 👤 Pascalino Enza
- 👤 Notarbartolo Paola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:13
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/16; C07C51/21; C07C51/255; C07C51/265; C07C51/43; C07C51/44; C07C51/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A PROCESS FOR RECOVERING BENZOIC ACID IN PURIFIED FORM FROM A RAW MATERIAL OBTAINED BY PARTIAL OXIDATION OF TOLUENE, AND WHICH INCLUDES BENZOIC ACID IN SOLUTION IN TOLUENE, COMPRISING THE STEPS (A) OF ADDING WATER TO SAID RAW MATERIAL IN AN AMOUNT IN EXCESS OF THAT REQUIRED TO FORM AT ATMOSPHERIC PRESSURE AN AZEOTROPE WITH TOLUENE, (B) DISTILLING SAID MIXTURE AT A TEMPERATURE HIGHER THAN THE BOILING POINT OF AN AZEOTROPIC MIXTURE OF WATER AND TOLUENE TO OBTAIN VAPOR OF WATER AND TOLUENE, AND
Claim 2
Dependent Claim
84 words
A PROCESS FOR RECOVERING BENZOIC ACID IN PURIFIED FORM FROM A RAW MATERIAL OBTAINED BY PARTIAL OXIDATION OF TOLUENE, AND WHICH INCLUDES BENZOIC ACID IN SOLUTION IN TOLUENE, COMPRISING THE STEPS (A) OF ADDING WATER TO SAID RAW MATERIAL IN AN AMOUNT IN EXCESS OF THAT REQUIRED TO FORM AT ATMOSPHERIC PRESSURE AN AZEOTROPE WITH TOLUENE, (B) DISTILLING SAID MIXTURE AT A TEMPERATURE HIGHER THAN THE BOILING POINT OF AN AZEOTROPIC MIXTURE OF WATER AND TOLUENE TO OBTAIN VAPOR OF WATER AND TOLUENE, AND
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |