US2655532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
N-oxoalkyl-para-aminosalicylic acids
Assignee: Individual
•
Filing: 1951-06-23
•
Granted: 1953-10-13
•
Expires: 1971-06-23
Abstract
No abstract record available.
Inventors
- 👤 Hopff Heinrich
- 👤 Spaenig Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:52
CPC Classifications
C; C07; C07C; C07C227/00; C07C227/04; C07C227/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
16 words
PARA-AMINO SALICYLIC ACID DERIVATIVES OF THE GROUP CONSISTING OF N-(GAMMA-OXO-BUTYL)-PARAAMINO SALICYLIC ACID AND N-DI-(GAMMA-OXOBUTYL)-PARA-AMINO SALICYLIC ACID.
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) | 1956-10-12 | 1957-04-13 | 1957-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-12 | 1961-04-13 | 1961-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-12 | 1965-04-13 | 1965-10-13 | $7700.00 | Window Closed / Lapsed |