US2541584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
N-acylated piperazines
Assignee: ChampionX LLC
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Filing: 1947-06-11
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Granted: 1951-02-13
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Expires: 1967-06-11
Abstract
No abstract record available.
Inventors
- 👤 Arthur L Jacoby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:53
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/16; C07D295/18; C07D295/182; C07D295/185
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
155 words
A DIACYLATED PIPERAZINE FROM THE GROUP CONSISTING OF (A) DIACYLATED PIPERAZINES IN WHICH BOTH ACYL GROUPS ARE DERIVED FROM ALIPHATIC CARBOXYLIC ACIDS AND IN WHICH SAID ACYL GROUPS ARE SUBSTANTIALLY EQUAL IN NUMBER OF CARBON ATOMS; (B) EACH CONTAINS AT LEAST 7 CARBON ATOMS; (B) DIACYLATED PIPERAZINES IN WHICH BOTH ACYL GROUPS ARE DERIVED FROM ALIPHATIC CARBOXYLIC ACIDS AND IN WHICH SAID ACYL GROUPS DIFFER WIDELY FROM EACH OTHER WITH RESPECT TO THE NUMBER OF CARBON ATOMS IN EACH, THE LARGER ACYL GROUP CONTAINING AT LEAST 11, CARBON ATOMS; (A) DIACYLATED PIPERAZINES IN WHICH ONE ACYL GROUP IS DERIVED FROM AN ALIPHATIC CARBOXYLIC ACID OF AT LEAST 12 CARBON ATOMS AND THE OTHER ACYL GROUP IS DERIVED FROM AN ARYLSULFONIC ACID; AND (D) DIACYLATED PIPERAZINES IN WHICH ONE ACYL GROUP IS DERIVED FROM AN ALIPHATIC CARBOXYLIC ACID OF AT LEAST 12 CARBON ATOMS AND THE OTHER ACYL GROUP IS DERIYED FROM AN AROMATIC CARBOXYLIC ACID.
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) | 1954-02-12 | 1954-08-14 | 1955-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-12 | 1958-08-14 | 1959-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-12 | 1962-08-14 | 1963-02-13 | $7700.00 | Window Closed / Lapsed |