Patent US1539833A successfully refreshed from Google Patents.
US3131218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
N-amino guanidine derivatives
Assignee: Smith Kline & French Laboratories Ltd
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Filing: 1962-02-07
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Granted: 1964-04-28
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Expires: 1982-02-07
Abstract
No abstract record available.
Inventors
- 👤 Spickett Robert Geoffr William
- 👤 Durant Graham John
- 👤 Bavin Patrick Michael Guy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:16
CPC Classifications
C; C07; C07C; C07C281/00; C07C281/16; C07C281/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
A CHEMICAL COMPOUND OF THE CLASS CONSISTING OF A FREE BASE AND ITS ADDITION SALTS WITH PHARMACEUTICALLY ACCEPTABLE ACIDS, SAID FREE BASE HAVING THE FORMULA:
Claim 2
Dependent Claim
25 words
A CHEMICAL COMPOUND OF THE CLASS CONSISTING OF A FREE BASE AND ITS ADDITION SALTS WITH PHARMACEUTICALLY ACCEPTABLE ACIDS, SAID FREE BASE HAVING THE FORMULA:
References Cited (Backward Citations)
US506282A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-28 | 1967-10-28 | 1968-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-28 | 1971-10-28 | 1972-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-28 | 1975-10-28 | 1976-04-28 | $7700.00 | Window Closed / Lapsed |