US3257404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piperazine derivatives of dibenzo[a,d] cycloheptadiene
Assignee: Rhone Poulenc SA
•
Filing: 1963-06-06
•
Granted: 1966-06-21
•
Expires: 1983-06-06
Abstract
No abstract record available.
Inventors
- 👤 Fouche Jean Clement Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:39
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/02; C07D295/04; C07D295/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
A QUATERNARY AMMONIUM COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE COMPOUNDS OF THE FROMULA:
Claim 2
Dependent Claim
15 words
A QUATERNARY AMMONIUM COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE COMPOUNDS OF THE FROMULA:
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-20 | 1969-12-20 | 1970-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-20 | 1973-12-20 | 1974-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-20 | 1977-12-20 | 1978-06-21 | $7700.00 | Window Closed / Lapsed |