Patent US2612484A successfully refreshed from Google Patents.
Patent US2653153A successfully refreshed from Google Patents.
US2653153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4-n-substituted-2-ketopiperazines
Assignee: Rohm and Haas Co
•
Filing: 1952-02-08
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Granted: 1953-09-22
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Expires: 1972-02-08
Abstract
No abstract record available.
Inventors
- 👤 Benneville Peter L De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:08
CPC Classifications
C; C07; C07D; C07D241/00; C07D241/02; C07D241/06; C07D241/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
8 words
AS NEW CHEMICAL SUBSTANCES COMPOUNDS OF THE FORMUAL
Claim 2
Dependent Claim
8 words
AS NEW CHEMICAL SUBSTANCES COMPOUNDS OF THE FORMUAL
Claim 3
Dependent Claim
22 words
A PROCESS FOR PREPARING COMPOUNDS OF THE FORMULA FIG02 WHICH COMPRISES REACTING BETWEEN 50* AND 180* C. A KETOPIPERAZINE OF THE FORMULA
Claim 4
Dependent Claim
22 words
A PROCESS FOR PREPARING COMPOUNDS OF THE FORMULA FIG02 WHICH COMPRISES REACTING BETWEEN 50* AND 180* C. A KETOPIPERAZINE OF THE FORMULA
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) | 1956-09-21 | 1957-03-23 | 1957-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-21 | 1961-03-23 | 1961-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-21 | 1965-03-23 | 1965-09-22 | $7700.00 | Window Closed / Lapsed |