Patent US2653157A successfully refreshed from Google Patents.
US2653157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
p-amino-salicylic acid derivatives and their production
Assignee: AG VORMALS B SIEGFRIED
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Filing: 1950-06-28
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Granted: 1953-09-22
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Expires: 1970-06-28
Abstract
No abstract record available.
Inventors
- 👤 Ursprung Rudolf Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:56
CPC Classifications
C; C07; C07C; C07C233/00; C07C233/01; C07C233/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
9 words
A NEW P-AMINO-SALICYLIC ACID COMPOUND HAVING THE FOLLOWING FORMULA
Claim 2
Dependent Claim
9 words
A NEW P-AMINO-SALICYLIC ACID COMPOUND HAVING THE FOLLOWING FORMULA
Claim 3
Dependent Claim
9 words
IN A PROCESS FOR PREPARING COMPOUNDS OF THE FORMULA
Claim 4
Dependent Claim
9 words
IN A PROCESS FOR PREPARING 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) | 1956-09-21 | 1957-03-23 | 1957-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-21 | 1961-03-23 | 1961-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-21 | 1965-03-23 | 1965-09-22 | $7700.00 | Window Closed / Lapsed |