Patent US3454643A successfully refreshed from Google Patents.
US3454643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
5 - (tertiaryaminoalkylene)-5 hydroxy- and 5-(tertiary aminoalkylidene) - dibenzocycloheptatrienes,and salts thereof
Assignee: Merck and Co Inc
•
Filing: 1959-04-27
•
Granted: 1969-07-08
•
Expires: 1979-04-27
Abstract
No abstract record available.
Inventors
- 👤 Arthur C Cope
- 👤 Edward L Engelhardt
- 👤 Katheryn Keene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:41
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/04; C07D295/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
5 words
A COMPOUND HAVING THE STRUCTURE:
Claim 2
Dependent Claim
5 words
A COMPOUND HAVING THE STRUCTURE:
Claim 3
Dependent Claim
5 words
A COMPOUND HAVING THE STRUCTURE:
Claim 4
Dependent Claim
5 words
A COMPOUND HAVING THE STRUCTURE:
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) | 1972-07-07 | 1973-01-06 | 1973-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-07 | 1977-01-06 | 1977-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-07 | 1981-01-06 | 1981-07-08 | $7700.00 | Window Closed / Lapsed |