US2663707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amino piperazines and methods of preparing the same
Assignee: Wyeth Holdings LLC
•
Filing: 1951-06-22
•
Granted: 1953-12-22
•
Expires: 1971-06-22
Abstract
No abstract record available.
Inventors
- 👤 Edward A Conroy
- 👤 Robert P Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:41
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/22; C07D295/28; C07D295/32
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
7 words
COMPOUNDS OF THE GROUP HAVING 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) | 1956-12-21 | 1957-06-22 | 1957-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-21 | 1961-06-22 | 1961-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-21 | 1965-06-22 | 1965-12-22 | $7700.00 | Window Closed / Lapsed |