Patent US2605268A successfully refreshed from Google Patents.
US2605268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alpha-amno-gamma-lactones
Assignee: —
•
Filing: —
•
Granted: 1952-07-29
•
Expires: 1969-07-29
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:13
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/34; C07D307/56; C07D307/66; C07D307/26; C07D307/30; C07D307/32; C07D307/33
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
THE METHOD OF PRODUCING A-(ETHYLPHENYLAMINO) BUTYROLACTONE WHICH COMPRISES REACTING A MEMBER OF THE GROUP CONSISTING OF A-CHLOROAND A-BROMOBUTYROLACTONE WITH AN EXCESS OF ETHYLANILINE SUFFICIENT TO SUBSTITUTE THE HALOGEN ATOM AND TO BIND THE HYDROGEN HALIDE SET FREE BY SAID SUBSTITUTION.
Claim 2
Independent Claim
40 words
THE METHOD OF PRODUCING A-(ETHYLPHENYLAMINO) BUTYROLACTONE WHICH COMPRISES REACTING A MEMBER OF THE GROUP CONSISTING OF A-CHLOROAND A-BROMOBUTYROLACTONE WITH AN EXCESS OF ETHYLANILINE SUFFICIENT TO SUBSTITUTE THE HALOGEN ATOM AND TO BIND THE HYDROGEN HALIDE SET FREE BY SAID SUBSTITUTION.
References Cited (Backward Citations)
US2421729A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-29 | 1956-01-28 | 1956-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-29 | 1960-01-28 | 1960-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-29 | 1964-01-28 | 1964-07-29 | $7700.00 | Window Closed / Lapsed |