US2647853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injectable solution of salt of para-aminosalicylic acid
Assignee: Laboratoires Francais de Chimiotherapie SA
•
Filing: 1950-11-28
•
Granted: 1953-08-04
•
Expires: 1970-11-28
Abstract
No abstract record available.
Inventors
- 👤 Larde Raymond
- 👤 Pesez Maurice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:27
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A PROCESS OF PREPARING STABLE, INJECTABLE AQUEOUS SOLUTIONS OF SALTS OF P-AMINO SALICYLIC ACID, COMPRISING DISSOLVING A SALT SELECTED FROM THE GROUP CONSISTING OF AN ALKALI METL SULFITE AND AN ALKALINE EARTH METAL SULFITE, AND A SALT OF P-AMINO SALICYLIC ACID IN WATER, ADDING TO SAID SOLUTION AN ALKALI HYDROXIDE SOLUTION TO ADJUST ITS PH TO 7.6-7.8, ADDING TO SAID SOLUTION A SALT SELECTED FROM THE GROUP CONSISTING OF AN ALKALI METAL HYDROSULFITE AND AN ALKALINE EARTH METAL HYDROUSULFITE, THE AMOUNTS OF SAID SULFITES AND HYDROSULFITES PRESENT IN SAID SOLUTION BEING SUCH THAT THE PERSISTENT EXCESS THEREOF IS AT THE MOST 0.75% BY WEIGHT OF THE SALT OF P-AMINO SALICYLIC ACID DISSOLVED IN SAID SOLUTION, AND STORING SAID AQUEOUS SOLUTION IN EVACUATED SEALED CONTAINERS.
Claim 2
Dependent Claim
124 words
A PROCESS OF PREPARING STABLE, INJECTABLE AQUEOUS SOLUTIONS OF SALTS OF P-AMINO SALICYLIC ACID, COMPRISING DISSOLVING A SALT SELECTED FROM THE GROUP CONSISTING OF AN ALKALI METL SULFITE AND AN ALKALINE EARTH METAL SULFITE, AND A SALT OF P-AMINO SALICYLIC ACID IN WATER, ADDING TO SAID SOLUTION AN ALKALI HYDROXIDE SOLUTION TO ADJUST ITS PH TO 7.6-7.8, ADDING TO SAID SOLUTION A SALT SELECTED FROM THE GROUP CONSISTING OF AN ALKALI METAL HYDROSULFITE AND AN ALKALINE EARTH METAL HYDROUSULFITE, THE AMOUNTS OF SAID SULFITES AND HYDROSULFITES PRESENT IN SAID SOLUTION BEING SUCH THAT THE PERSISTENT EXCESS THEREOF IS AT THE MOST 0.75% BY WEIGHT OF THE SALT OF P-AMINO SALICYLIC ACID DISSOLVED IN SAID SOLUTION, AND STORING SAID AQUEOUS SOLUTION IN EVACUATED SEALED CONTAINERS.
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) | 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 |