US2858251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indolo [2, 3-c] quinazo [3, 2-a] pyridine derivatives
Assignee: Smith Kline & French Laboratories Ltd
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Filing: 1956-10-18
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Granted: 1958-10-28
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Expires: 1976-10-18
Abstract
No abstract record available.
Inventors
- 👤 Irwin J Pachter
- 👤 Robert F Raffanf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:32
CPC Classifications
C; C07; C07D; C07D471/00; C07D471/12; C07D471/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
AN ANTIHYPERTENSIVE MEDICINAL COMPOSITION COMPRISING A PHARMACEUTICAL CARRIER AND A COMPOUND OF THE CLASS CONSISTING OF A FREE BASE AND ITS ACID ADDITION METHYL IODIDE, ETHYL BROMIDE, N-HEXYL BROMIDE, BENZYL CHLORIDE, METHYL SULFATE, ETHYL SULFATE AND METHYL P-TOLUENE SULFONATE, SALTS, THE FREE BASE HAVING THE FORMULA:
Claim 2
Dependent Claim
46 words
AN ANTIHYPERTENSIVE MEDICINAL COMPOSITION COMPRISING A PHARMACEUTICAL CARRIER AND A COMPOUND OF THE CLASS CONSISTING OF A FREE BASE AND ITS ACID ADDITION METHYL IODIDE, ETHYL BROMIDE, N-HEXYL BROMIDE, BENZYL CHLORIDE, METHYL SULFATE, ETHYL SULFATE AND METHYL P-TOLUENE SULFONATE, SALTS, THE 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) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |