Patent US4028745A successfully refreshed from Google Patents.
Patent US3050847A successfully refreshed from Google Patents.
US3050847A
Expired / Lapsed
US
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Method of preventing the surface staining of cold rolled steel
Assignee: Inland Steel Co
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Filing: 1958-04-01
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Granted: 1962-08-28
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Expires: 1978-04-01
Abstract
No abstract record available.
Inventors
- 👤 Uno T Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:42
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/02; C21D8/0278; C23; C23G; C23G1/00; C21D8/0284; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4981; Y10T29/49812
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
IN THE PRODUCTION OF HOT-ROLLED, PRICKLED, COLD-REDUCED AND BOX-ANNELED LOW-CARBON, STEEL STRIP, THE STEP WHICH COMPRISES IMMERSING A HOT-ROLLED STEEL STRIP IN A PICKLING SOLUTION AND THEREAFTER RINSING THE STEEL STRIP WITH AN AQUEOUS SOLUTION OF A HARD WATER CONTAINING SUFFICIENT AMOUNTS OF A WATER-SOLUBLE, INORGANIC CONDENSED PHOSPHATE TO COMBINE WITH OBJECTIONABLE, PRECIPITATEFORMING METAL IONS IN SAID HARD WATER TO FORM STABLE,
Claim 2
Dependent Claim
62 words
IN THE PRODUCTION OF HOT-ROLLED, PRICKLED, COLD-REDUCED AND BOX-ANNELED LOW-CARBON, STEEL STRIP, THE STEP WHICH COMPRISES IMMERSING A HOT-ROLLED STEEL STRIP IN A PICKLING SOLUTION AND THEREAFTER RINSING THE STEEL STRIP WITH AN AQUEOUS SOLUTION OF A HARD WATER CONTAINING SUFFICIENT AMOUNTS OF A WATER-SOLUBLE, INORGANIC CONDENSED PHOSPHATE TO COMBINE WITH OBJECTIONABLE, PRECIPITATEFORMING METAL IONS IN SAID HARD WATER TO FORM STABLE,
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-08-27 | 1966-02-26 | 1966-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-27 | 1970-02-26 | 1970-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-27 | 1974-02-26 | 1974-08-28 | $7700.00 | Window Closed / Lapsed |