Patent US3781423A successfully refreshed from Google Patents.
US3781423A
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US
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Method for preventing coloring of vitamin c
Assignee: Takeda Pharmaceutical Co Ltd
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Filing: 1969-01-14
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Granted: 1973-12-25
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Expires: 1989-01-14
Abstract
Abstract COLORING OF VITAMIN C COMPOSITIONS IS PREVENTED BY INCORPORATING AN EFFECTIVE AMOUNT, AS AN ANTI-COLORING AGENT, OF A MERCAPTOPROPIONYLGLYCINE OF THE FORMULAE: CH3-CH(-S-R)-CO-NH-CH2-CO-X, OR R-S-(CH2)2-CO-NH-CH2-CO-X WHEREIN R STANDS FOR H, ACETYL OR BENZOYL AND X FOR -OH OR -NH2, OR A MIXTURE OF MORE THAN ONE OF THEM, INTO A COMPOSITION CONTAINING VITAMIN C.
Inventors
- 👤 K Aoka
- 👤 S Izuhara
- 👤 K Yatani
- 👤 E Kometani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:14
CPC Classifications
A; A61; A61K; A61K47/00; A61K47/06; A61K47/20; A61K31/00; A61K31/16; A61K31/185; A61K31/19; A61K31/195; A61K31/33; A61K31/335; A61K31/365; A61K31/375; A61K31/395; A61K31/495; A61K31/505; A61K31/519; A61K31/52; A61K31/70
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |