Patent US3666409A successfully refreshed from Google Patents.
US3666409A
Expired / Lapsed
US
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Method of stabilizing sodium hydrosulfite
Assignee: Mitsubishi Edogawa Kagaku KK
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Filing: 1969-08-25
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Granted: 1972-05-30
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Expires: 1989-08-25
Abstract
Abstract SODIUM HYDROSULFITE IS STABILIZED BY USING AN ALIPHATIC AMINE CONTAINING FIVE OR MORE CARBON ATOMS.
Inventors
- 👤 Yoshio Yoshikawa
- 👤 Yasuhiro Sakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:12
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/64; C01B17/66; C01B17/665
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |