US3709824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and composition for chemical polishing of stainless steel surfaces
Assignee: Nippon Soda Co Ltd
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Filing: 1971-01-07
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Granted: 1973-01-09
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Expires: 1991-01-07
Abstract
Abstract STAINLESS STEEL SURFACES ARE TREATED WITH AN AQUEOUS SOLUTION CONTAINING PHOSPHORIC IONS EQUIVALENT TO 145 580 G./LITRE OF PHOSPHORIC ACID, NITRATE IONS EQUIVALENT TO 17-85 G./LITRE OF NITRIC ACID, CHLORINE IONS EQUIVALENT TO 16-80 G./LITRE OF HYDROCHLORIC ACID, SULFOSALICYLATE IONS EQUIVALENT OT 1-10 G./LITRE OF SULFOSALICYLIC ACID AND SMALL AMOUNTS OF OPTICAL COMPOUNDS SELECTED FROM THE GROUP OF WATER SOLUBLE POLYMER, AROMATIC AMINO COMPOUNDS, SURFACTANT, LIGNINSULFONIC ACID AND SALTS THEREOF, SULFURIC ACID AND ACIDS HAVING EQUIVALENT CONCENTRATION OF 4.0 N-18 N.
Inventors
- 👤 N Oda
- 👤 A Yoshida
- 👤 N Morioka
- 👤 Y Makino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:05
CPC Classifications
C; C23; C23F; C23F3/00; C23F3/04; C23F3/06; C11; C11D; C11D7/00; C11D7/02; C11D7/04; C11D7/08
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |