US3585143A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing copper-containing iron oxide incrustations from ferrous metal surfaces using an aqueous acid solution of o-amino thiophenol
Assignee: Richardson Co
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Filing: 1968-09-30
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Granted: 1971-06-15
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Expires: 1988-09-30
Abstract
Abstract A METHOD OF REMOVING COPPER-CONTAINING IRON OXIDE INCRUSTATIONS FROM FERROUS METAL SURFACES THROUGH THE USE OF AN O-AMINO THIOPHENOL IN SOLUTION WITH AN ACID CAPABLE OF DISSOLVING THE INCRUSTATIONS. THE USE OF O-AMINO, THIOPHENOL PREVENTS REDEPOSITION OF COPPER AS A PLATING, IMPROVES THE REMOVEL OF IRON OXIDES IN ADDITION TO COPPER AT LOWER TEMPERATURES, AND IMPROVES THE IRON OXIDE REMOVING PERFORMANCE OF THIOUREA IN ACID SOLUTIONS.
Inventors
- 👤 Thaddeus M Muzyczko
- 👤 William J Ludwig
- 👤 Jon A Loboda
- 👤 Samuel Shore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:26
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/08
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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |