US2566992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of imides
Assignee: Standard Oil Development Co
•
Filing: 1948-11-06
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Granted: 1951-09-04
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Expires: 1968-11-06
Abstract
No abstract record available.
Inventors
- 👤 Morgan Jerome Perry
- 👤 Ernest O Ohsol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:03
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/30; C07D207/34; C07D207/36; C07D207/40; C07D207/404; C07D209/00; C07D209/02; C07D209/44; C07D209/48; C07D209/56; C07D209/58; C07D209/72; C07D209/76
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A CONTINUOUS PROCESS FOR THE PREPARATION OF AN ORGANIC IMIDE OF A DICARBOXYLIC ACID WHICH COMPRISES THE STEPS OF CONTINUOUSLY INTRODUCING AN ANHYDRIDE OF THE CORRESPONDING DICARBOXYLIC ACID INTO AN INTERMEDIATE PORTION OF A FRACTIONATING ZONE, CONTINUOUSLY REFLUXING WITHIN THE FRACTIONATING ZONE AT A TEMPERATURE BELOW THE BOILING POINT OF THE ANHYDRIDE AN ORGANIC SOLVENT FOR THE ANHYDRIDE, SAID ORGANIC SOLVENT BEING CAPABLES OF AZEOTROPING WITH WATER; FEEDING AMMONIA GAS INTO A LOWER PORTION OF THE FRACTIONATING ZONE; WITHDRAWING OVERHEAD A VAPORUS MIXTURE OF WATER-ORGANIC SOLVENT AZEOTROPE AND AMMONIA AND CONTINUOUSLY RECOVERING THE ORGANIC IMIDE WHICH HAS BEEN HEATED TO A TEMPERATURE ABOVE ITS MELTING POINT BUT BELOW ITS BOILING POINT IN A MOLTEN STATE FROM A BOTTOM PORTION OF THE FRACTIONATING ZONE.
Claim 2
Dependent Claim
123 words
A CONTINUOUS PROCESS FOR THE PREPARATION OF AN ORGANIC IMIDE OF A DICARBOXYLIC ACID WHICH COMPRISES THE STEPS OF CONTINUOUSLY INTRODUCING AN ANHYDRIDE OF THE CORRESPONDING DICARBOXYLIC ACID INTO AN INTERMEDIATE PORTION OF A FRACTIONATING ZONE, CONTINUOUSLY REFLUXING WITHIN THE FRACTIONATING ZONE AT A TEMPERATURE BELOW THE BOILING POINT OF THE ANHYDRIDE AN ORGANIC SOLVENT FOR THE ANHYDRIDE, SAID ORGANIC SOLVENT BEING CAPABLES OF AZEOTROPING WITH WATER; FEEDING AMMONIA GAS INTO A LOWER PORTION OF THE FRACTIONATING ZONE; WITHDRAWING OVERHEAD A VAPORUS MIXTURE OF WATER-ORGANIC SOLVENT AZEOTROPE AND AMMONIA AND CONTINUOUSLY RECOVERING THE ORGANIC IMIDE WHICH HAS BEEN HEATED TO A TEMPERATURE ABOVE ITS MELTING POINT BUT BELOW ITS BOILING POINT IN A MOLTEN STATE FROM A BOTTOM PORTION OF THE FRACTIONATING ZONE.
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) | 1954-09-03 | 1955-03-05 | 1955-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-03 | 1959-03-05 | 1959-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-03 | 1963-03-05 | 1963-09-04 | $7700.00 | Window Closed / Lapsed |