Patent US2492667A successfully refreshed from Google Patents.
US2492667A
Expired / Lapsed
US
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Production of citric acid by fermentation
Assignee: Bayer Corp
•
Filing: 1947-04-12
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Granted: 1949-12-27
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Expires: 1967-04-12
Abstract
No abstract record available.
Inventors
- 👤 Raymond L Snell
- 👤 Leonard B Schweiger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:49
CPC Classifications
C; C12; C12P; C12P7/00; C12P7/40; C12P7/44; C12P7/48; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/911; Y10S435/913; Y10S435/917
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US525823A
Cited
US628067A
Cited
US1212656A
Cited
US1740163A
Cited
US2006086A
Cited
US2394031A
Cited
US2400143A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-26 | 1953-06-27 | 1953-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-26 | 1957-06-27 | 1957-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-26 | 1961-06-27 | 1961-12-27 | $7700.00 | Window Closed / Lapsed |