US2555353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
3-tertiaryaminoalkyl-2-pyrrolidones and process for preparing same and related products
Assignee: STWB Inc
•
Filing: 1949-01-14
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Granted: 1951-06-05
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Expires: 1969-01-14
Abstract
No abstract record available.
Inventors
- 👤 Lucas Philip
- 👤 Robert L Clarke
- 👤 Mooradian Aram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:10
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D207/26; C07D207/263; C07D207/27
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
THE METHOD OF PREPARING AN N-ALKYL-5-6MEMBERED LACTAM WHICH COMPRISES REACTING A CHLORIDE OF A STRONG ACID WITH A DIALKYLAMINOCARBOXYLIC ACID, WHEREIN A SATURATED CHAIN OF 3-4 CARBON ATOMS INTERVES BETWEEN THE CARBOXYL CARCON ATOM AND THE DIALKYLAMINO NITROGEN ATOM, HEATING THE DIALKYLAMINO-CARBOXYLIC ACID CHLORIDE THUS FORMED AND ISOLATING THE RESULTING N-ALKYL-5-6-MEMBERED LACTAM.
Claim 2
Independent Claim
52 words
THE METHOD OF PREPARING AN N-ALKYL-5-6MEMBERED LACTAM WHICH COMPRISES REACTING A CHLORIDE OF A STRONG ACID WITH A DIALKYLAMINOCARBOXYLIC ACID, WHEREIN A SATURATED CHAIN OF 3-4 CARBON ATOMS INTERVES BETWEEN THE CARBOXYL CARCON ATOM AND THE DIALKYLAMINO NITROGEN ATOM, HEATING THE DIALKYLAMINO-CARBOXYLIC ACID CHLORIDE THUS FORMED AND ISOLATING THE RESULTING N-ALKYL-5-6-MEMBERED LACTAM.
References Cited (Backward Citations)
GB501135A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-04 | 1954-12-04 | 1955-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-04 | 1958-12-04 | 1959-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-04 | 1962-12-04 | 1963-06-05 | $7700.00 | Window Closed / Lapsed |