US3891646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
5-(2-Aminoethyl)-2,3-dioxopiperazines
Assignee: AH Robins Co Inc
•
Filing: 1972-02-29
•
Granted: 1975-06-24
•
Expires: 1992-02-29
Abstract
Abstract 1-Hydrocarbon-5-(2-aminoethyl)-4-aryl-2,3-dioxopiperazines active as antiviral agents are disclosed.
Inventors
- 👤 Carl Dalton Lunsford
- 👤 Jr Albert Duncan Cale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:12
CPC Classifications
C; C07; C07D; C07D241/00; C07D241/02; C07D241/04; C07D241/06; C07D241/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
8 words
A COMPOUND SELECTED FROM 5-(2-AMINOETHYI)-2,3-DIOXOPIPERAZINES HAVING THE FORMULA:
Claim 2
Dependent Claim
8 words
A COMPOUND SELECTED FROM 5-(2-AMINOETHYI)-2,3-DIOXOPIPERAZINES HAVING THE FORMULA:
Claim 3
Dependent Claim
8 words
A compound of claim 1 which is 2,3-dioxo-5-(2-dimethylaminoethyl)-1-isopropyl-4-phenylpiperazine.
Claim 4
Dependent Claim
9 words
A compound of claim 1 which is 5-(2-dimethylaminoethyl)-2, 3-dioxo-1-methyl-4-phenylpiperazine.
Claim 5
Dependent Claim
8 words
A compound of claim 1 which is 5-(2-dimethylaminoethyl)-2,3-dioxo-1-ethyl-4-phenylpiperazine.
Claim 6
Dependent Claim
8 words
A compound of claim 1 which is 1-cyclohexyl-2,3-dioxo-5-(2-dimethylaminoethyl)-4-phenylpiperazine.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |