Patent US2542994A successfully refreshed from Google Patents.
US2542994A
Expired / Lapsed
US
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Electrolytic surface treatment of steel
Assignee: Armco Inc
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Filing: 1945-07-09
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Granted: 1951-02-27
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Expires: 1965-07-09
Abstract
No abstract record available.
Inventors
- 👤 Harold W Cobb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:48
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
IN TREATING ALLOY STEEL ARTICLES CONTAINING AT LEAST 10% CHROMIUM TO OBTAIN A HARD, ADHERENT, ABRASION-RESISTING SURFACE, THE ART WHICH COMPRISES, SURFACE-BLACKENING SUCH ARTICLES IN A FUSED SALT BATH CONSISTING OF SALT OF THE GROUP CONSISTING OF SODIUM DICHROMATE AND POTASSIUM DICHROMATE, AND THEN SUBJECTING THE SAME TO ELECTRICAL CATHODIZING TREATMENT FOR AT LEAST ABOUT FIVE MINUTES IN A FUSED SALT BATH CONSISTING ESSENTIALLY OF SALT OF THE GROUP CONSISTING OF SODIUM DICHROMATE AND POTASSIUM DICHROMATE.
Claim 2
Dependent Claim
76 words
IN TREATING ALLOY STEEL ARTICLES CONTAINING AT LEAST 10% CHROMIUM TO OBTAIN A HARD, ADHERENT, ABRASION-RESISTING SURFACE, THE ART WHICH COMPRISES, SURFACE-BLACKENING SUCH ARTICLES IN A FUSED SALT BATH CONSISTING OF SALT OF THE GROUP CONSISTING OF SODIUM DICHROMATE AND POTASSIUM DICHROMATE, AND THEN SUBJECTING THE SAME TO ELECTRICAL CATHODIZING TREATMENT FOR AT LEAST ABOUT FIVE MINUTES IN A FUSED SALT BATH CONSISTING ESSENTIALLY OF SALT OF THE GROUP CONSISTING OF SODIUM DICHROMATE AND POTASSIUM DICHROMATE.
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) | 1954-02-26 | 1954-08-28 | 1955-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-26 | 1958-08-28 | 1959-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-26 | 1962-08-28 | 1963-02-27 | $7700.00 | Window Closed / Lapsed |