US3287237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface treatment of bright annealed strip
Assignee: Allegheny Ludlum Steel Corp
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Filing: 1964-02-06
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Granted: 1966-11-22
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Expires: 1984-02-06
Abstract
No abstract record available.
Inventors
- 👤 Joseph W Wilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:11
CPC Classifications
C; C25; C25F; C25F3/00; C25F3/16; C25F3/22; C25F3/24; C25D; C25D11/00; C25D11/02; C25D11/26; C25D11/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
THE METHOD OF PROVIDING A BRIGHT STAINLESS STEEL SURFACE WHICH IS RESISTANT TO CORROSIVE PITTING WHICH STAINLESS SETTL HAS BEEN BRIGHT ANNEALED BY HEATING IN THE PRESENCE OF A REDUCING ATMOSPHERE WHICH METHOD COMPRISES, IMMERSING SAID STEEL IN AN AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF AN ORGANIC ACID SELECTED FROM THE GROUP CONSISTING OF ACETIC, FORMIC, CITRIC, MONOCHLORACETIC AND PICRIC, SAID ACID BEING OF SUFFICIENT CONCENTRATION TO PASS A CURRENT DENSITY OF AT LEAST 0.1 AMPERE PER SQUARE INCH OF SURFACE AREA OF IMMERSED STEEL, MAINTAINING SAID SOLUTION AT A TEMPERATURE WITHIN THE RANGE BETWEEN 40*F. AND 120*F., AND RENDERING SAID STEEL ANODIC AT A CURRENT DENSITY OF FROM 0.1 TO 1.0 AMPERE PER SQUARE INCH OF SURFACE AREA OF IMMERSED STEEL.
Claim 2
Independent Claim
121 words
THE METHOD OF PROVIDING A BRIGHT STAINLESS STEEL SURFACE WHICH IS RESISTANT TO CORROSIVE PITTING WHICH STAINLESS SETTL HAS BEEN BRIGHT ANNEALED BY HEATING IN THE PRESENCE OF A REDUCING ATMOSPHERE WHICH METHOD COMPRISES, IMMERSING SAID STEEL IN AN AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF AN ORGANIC ACID SELECTED FROM THE GROUP CONSISTING OF ACETIC, FORMIC, CITRIC, MONOCHLORACETIC AND PICRIC, SAID ACID BEING OF SUFFICIENT CONCENTRATION TO PASS A CURRENT DENSITY OF AT LEAST 0.1 AMPERE PER SQUARE INCH OF SURFACE AREA OF IMMERSED STEEL, MAINTAINING SAID SOLUTION AT A TEMPERATURE WITHIN THE RANGE BETWEEN 40*F. AND 120*F., AND RENDERING SAID STEEL ANODIC AT A CURRENT DENSITY OF FROM 0.1 TO 1.0 AMPERE PER SQUARE INCH OF SURFACE AREA OF IMMERSED STEEL.
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) | 1969-11-21 | 1970-05-23 | 1970-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-21 | 1974-05-23 | 1974-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-21 | 1978-05-23 | 1978-11-22 | $7700.00 | Window Closed / Lapsed |