US2647896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spiro [cyclohexane-1, 9'-fluorene] amines
Assignee: Bayer Corp
•
Filing: 1952-04-11
•
Granted: 1953-08-04
•
Expires: 1972-04-11
Abstract
No abstract record available.
Inventors
- 👤 Dale A Stauffer
- 👤 Otis E Fancher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:35
CPC Classifications
C; C07; C07C; C07C49/00; C07C49/587; C07C49/657; C07C49/665
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
A COMPOUND OF THE CLASS CONSISTING OF A FREE BASE AND SALTS THEREOF, SAID FREE BASE HAVING THE FORMULA
Claim 2
Dependent Claim
19 words
A COMPOUND OF THE CLASS CONSISTING OF A FREE BASE AND SALTS THEREOF, SAID FREE BASE 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) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |