Patent US2827459A successfully refreshed from Google Patents.
US2827459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piperazine derivatives
Assignee: Rhone Poulenc SA
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Filing: 1956-12-26
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Granted: 1958-03-18
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Expires: 1976-12-26
Abstract
No abstract record available.
Inventors
- 👤 Horciois Raymond Jacques
- 👤 Suau Edouard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:17
CPC Classifications
C; C07; C07D; C07D473/00; C07D473/02; C07D473/04; C07D473/06; C07D473/08; C07D473/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
AS A NEW COMPOSITION OF MATTER A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF THE PIPERAZINE BASES OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
21 words
AS A NEW COMPOSITION OF MATTER A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF THE PIPERAZINE BASES OF THE GENERAL 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) | 1961-03-17 | 1961-09-16 | 1962-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-17 | 1965-09-16 | 1966-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-17 | 1969-09-16 | 1970-03-18 | $7700.00 | Window Closed / Lapsed |