US2703303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of l. l. d-active substances by streptomyces
Assignee: Merck and Co Inc
•
Filing: 1950-02-25
•
Granted: 1955-03-01
•
Expires: 1970-02-25
Abstract
No abstract record available.
Inventors
- 👤 Edward L Rickes
- 👤 Thomas R Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:40
CPC Classifications
C; C07; C07H; C07H23/00; C12; C12P; C12P19/00; C12P19/26; C12P19/28; C12P19/42; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/886; Y10S435/896; Y10S435/897
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A PROCESS FOR THE PRODUCTION OF AN L.L.D.-ACTIVE SUBSTANCES WHICH COMPRISES FERMENTING AN AQUEOUS NUTRIENT MEDIUM UNDER SUBMERGED AERATED CONDITIONS BY MEANS OF AN L.L.D.-ACTIVITY PRODUCING STRAIN OF A STREPTOMYCES, EXTRACTING L.L.D. SUBSTANCES THEREFROM, AND RECOVERING FROM THE RESULTING EXTRACT AN L.L.D.-ACTIVE COMPOSITION HAVING AN L.L.D ACTIVITY OF AT LEAST 440 L.L.D. UNITS PER MILLIGRAM.
Claim 2
Dependent Claim
55 words
A PROCESS FOR THE PRODUCTION OF AN L.L.D.-ACTIVE SUBSTANCES WHICH COMPRISES FERMENTING AN AQUEOUS NUTRIENT MEDIUM UNDER SUBMERGED AERATED CONDITIONS BY MEANS OF AN L.L.D.-ACTIVITY PRODUCING STRAIN OF A STREPTOMYCES, EXTRACTING L.L.D. SUBSTANCES THEREFROM, AND RECOVERING FROM THE RESULTING EXTRACT AN L.L.D.-ACTIVE COMPOSITION HAVING AN L.L.D ACTIVITY OF AT LEAST 440 L.L.D. UNITS PER MILLIGRAM.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-02-28 | 1958-08-30 | 1959-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-28 | 1962-08-30 | 1963-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-28 | 1966-08-30 | 1967-03-01 | $7700.00 | Window Closed / Lapsed |