US3726772A
Expired / Lapsed
US
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Method for removing iron impurities contained in a salt bath for nitrogenation
Assignee: Mitsubishi Motors Corp
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Filing: 1971-02-02
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Granted: 1973-04-10
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Expires: 1991-02-02
Abstract
Abstract THE PRESENT INVENTION RELATES TO A PROCESS FOR SURELY AND ECONOMICALLY REMOVING IRON IMPURITIES CONTAINED IN A SALT BATH FOR NITRIZATION COMPRISING CYANIDE AND CYANATE BY ELECTROCHEMICALLY DEPOSITING THE IRON IMPURITIES ON A CATHODE USING AN ANODIC AND A CATHODIC ELECTRODE PROVIDED IN THE SALT BATH.
Inventors
- 👤 Y Shimizu
- 👤 S Takahashi
- 👤 T Uehara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:25
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/40; C23C8/42; C23C8/48; C23C8/50
Claims Analysis
Total Claims: 0
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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) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |