US2828307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Karl h
Assignee: —
•
Filing: —
•
Granted: 1958-03-25
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Expires: 1975-03-25
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:22
CPC Classifications
C; C07; C07D; C07D201/00; C07D201/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
A PROCESS FOR PRODUCING PURIFIED LACTAMS FROM A CRUDE ORGANIC SOLVENT SOLUTION THEREOF CONTAMINATED WITH SUBSTANTIALLY IONOGENIC IMPURITIES WHICH CONSISTS ESSENTIALLY OF THE STEPS OF REMOVING SAID ORGANIC SOLVENT FROM SAID CRUDE LACTAMS AND FORMING AN AQUEOUS SOLUTION OF SAID CRUDE LACTAMS SUBSTANTIALLY FREE FROM ORGANIC SOLVENT, WHEREIN THE CONCENTRATION OF SAID CRUDE LACTAMS IN SAID AQUEOUS SOLUTION IS BETWEEN 5% AND 60% BY WEIGHT, TREATING SAID AQUEOUS SOLUTION WITH AN ION EXCHANGE RESIN SELECTED FROM THE GROUP CONSISTING OF STRONGLY ACIDIC CATION EXCHANGE RESINS AND STRONGLY BASIC ANION EXCHANGE RESINS, REMOVING AND COLLECTING SAID AQUEOUS SOLUTION FROM SAID ANION EXCHANGE RESIN AND REMOVING THE WATER THEREFROM UNDER REDUCED PRESSURE TO RECOVER WATERWHITE PURIFIED LACTAMS AND REGENERATING SAID ION EXCHANGE RESIN AFTER EXHAUSTION THEREOF SO AS TO PERMIT ITS RE-USE IN SAID PROCESS.
Claim 2
Dependent Claim
133 words
A PROCESS FOR PRODUCING PURIFIED LACTAMS FROM A CRUDE ORGANIC SOLVENT SOLUTION THEREOF CONTAMINATED WITH SUBSTANTIALLY IONOGENIC IMPURITIES WHICH CONSISTS ESSENTIALLY OF THE STEPS OF REMOVING SAID ORGANIC SOLVENT FROM SAID CRUDE LACTAMS AND FORMING AN AQUEOUS SOLUTION OF SAID CRUDE LACTAMS SUBSTANTIALLY FREE FROM ORGANIC SOLVENT, WHEREIN THE CONCENTRATION OF SAID CRUDE LACTAMS IN SAID AQUEOUS SOLUTION IS BETWEEN 5% AND 60% BY WEIGHT, TREATING SAID AQUEOUS SOLUTION WITH AN ION EXCHANGE RESIN SELECTED FROM THE GROUP CONSISTING OF STRONGLY ACIDIC CATION EXCHANGE RESINS AND STRONGLY BASIC ANION EXCHANGE RESINS, REMOVING AND COLLECTING SAID AQUEOUS SOLUTION FROM SAID ANION EXCHANGE RESIN AND REMOVING THE WATER THEREFROM UNDER REDUCED PRESSURE TO RECOVER WATERWHITE PURIFIED LACTAMS AND REGENERATING SAID ION EXCHANGE RESIN AFTER EXHAUSTION THEREOF SO AS TO PERMIT ITS RE-USE IN SAID PROCESS.
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) | 1961-03-24 | 1961-09-23 | 1962-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-24 | 1965-09-23 | 1966-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-24 | 1969-09-23 | 1970-03-25 | $7700.00 | Window Closed / Lapsed |