Patent US2498574A successfully refreshed from Google Patents.
US2498574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dihydrostreptomycin and acid addition salts
Assignee: Merck and Co Inc
•
Filing: 1946-02-15
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Granted: 1950-02-21
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Expires: 1966-02-15
Abstract
No abstract record available.
Inventors
- 👤 Robert L Peck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:36
CPC Classifications
C; C07; C07H; C07H15/00; C07H15/20; C07H15/22; C07H15/238; Y; Y10; Y10S; Y10S435/00; Y10S435/803
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
30 words
THE PROCESS THAT COMPRISES REACTING AN ACID SALT OF STEPTOMYCIN WITH HYDROGEN IN THE PRESENCE OF A HYDROGENATION CATALYST AND RECOVERING THE CORRESPONDING SALT OF DIHYDROSTREPTOMYCIN FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
30 words
THE PROCESS THAT COMPRISES REACTING AN ACID SALT OF STEPTOMYCIN WITH HYDROGEN IN THE PRESENCE OF A HYDROGENATION CATALYST AND RECOVERING THE CORRESPONDING SALT OF DIHYDROSTREPTOMYCIN FROM THE REACTION MIXTURE.
Claim 3
Dependent Claim
12 words
A SUBSTANCE OF THE CLASS CONSISTING OF DIHYDROSTREPTOMYCIN AND ACID SALTS THEREOF.
Claim 4
Dependent Claim
12 words
A SUBSTANCE OF THE CLASS CONSISTING OF DIHYDROSTREPTOMYCIN AND ACID SALTS THEREOF.
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) | 1953-02-20 | 1953-08-22 | 1954-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-20 | 1957-08-22 | 1958-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-20 | 1961-08-22 | 1962-02-21 | $7700.00 | Window Closed / Lapsed |