US2691677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anticholinesterase derivatives
Assignee: SmithKline Beecham Corp
•
Filing: 1952-10-03
•
Granted: 1954-10-12
•
Expires: 1972-10-03
Abstract
No abstract record available.
Inventors
- 👤 Copp Frederick Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:46
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/32; C07C1/321; C07C1/323
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
4 words
COMPOUNDS OF THE FORMULA:
Claim 2
Dependent Claim
4 words
COMPOUNDS OF 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) | 1957-10-11 | 1958-04-12 | 1958-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-11 | 1962-04-12 | 1962-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-11 | 1966-04-12 | 1966-10-12 | $7700.00 | Window Closed / Lapsed |