US2421612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of 2-keto gulonic acid and its salts
Assignee: Individual
•
Filing: 1945-05-04
•
Granted: 1947-06-03
•
Expires: 1965-05-04
Abstract
No abstract record available.
Inventors
- 👤 Byron E Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:55
CPC Classifications
C; C07; C07H; C07H7/00; C07H7/02; C07H7/027; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/823
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2168878A
Cited
US2318641A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-02 | 1950-12-02 | 1951-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-02 | 1954-12-02 | 1955-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-02 | 1958-12-02 | 1959-06-03 | $7700.00 | Window Closed / Lapsed |