Patent US2478404A successfully refreshed from Google Patents.
US2478404A
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US
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Substance extracted from growth medium of rhizopus nigricans and method of obtaining the same
Assignee: Merck and Co Inc
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Filing: 1944-05-19
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Granted: 1949-08-09
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Expires: 1964-05-19
Abstract
No abstract record available.
Inventors
- 👤 John C Keresztesy
- 👤 Rickes Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:29
CPC Classifications
C; C12; C12P; C12P1/00; C12P1/02; C12N; C12N1/00; C12N1/14; C12N1/145; C12R; C12R2001/00; C12R2001/645; C12R2001/845
Claims Analysis
Total Claims: 0
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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) | 1952-08-08 | 1953-02-07 | 1953-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-08 | 1957-02-07 | 1957-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-08 | 1961-02-07 | 1961-08-09 | $7700.00 | Window Closed / Lapsed |