Patent US2973307A successfully refreshed from Google Patents.
US2973307A
Expired / Lapsed
US
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Method of treating stainless steel
Assignee: Lyon Inc
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Filing: 1956-11-16
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Granted: 1961-02-28
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Expires: 1976-11-16
Abstract
No abstract record available.
Inventors
- 👤 Edgar A Hahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:07
CPC Classifications
C; C25; C25F; C25F1/00; C25D; C25D5/00; C25D5/34; C25D5/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
THE METHOD OF PREPARING AUSTENITIC STAINLESS STEEL FOR RECEIVING A CHROMIUM PLATE, WHICH CONSISTS ESSENTIALLY IN SUBJECTING SAID STAINLESS STEEL TO ANODIC CLEANING IN AN ALKALINE BATH CONTAINING AN ALKALI METAL SALT SELECTED FROM THE GROUP CONSISTING OF SILICATES AND PHOSPHATES AND HAVING AN ALKALINITY EQUIVALENT TO FROM 10 TO 16 OZ./GAL. OF NAOH TO REMOVE GREASE AND SURFACE OXIDES, WITH DRAWING SAID STEEL AFTER A SHORT PERIOD OF TIME IN THE NEIGHBORHOOD OF 1/2 TO 2 1/2 MINUTES, RINSING, DIPPING THE STEEL IN A DILUTE SULPHURIC ACID BATH AND AGAIN RINSING BEFORE CHROMIUM PLATING SAID STEEL AND WITHOUT FURTHER PROCESSING SAID STEEL BRIGHT CHROMIUM PLATING THE SAME.
Claim 2
Independent Claim
108 words
THE METHOD OF PREPARING AUSTENITIC STAINLESS STEEL FOR RECEIVING A CHROMIUM PLATE, WHICH CONSISTS ESSENTIALLY IN SUBJECTING SAID STAINLESS STEEL TO ANODIC CLEANING IN AN ALKALINE BATH CONTAINING AN ALKALI METAL SALT SELECTED FROM THE GROUP CONSISTING OF SILICATES AND PHOSPHATES AND HAVING AN ALKALINITY EQUIVALENT TO FROM 10 TO 16 OZ./GAL. OF NAOH TO REMOVE GREASE AND SURFACE OXIDES, WITH DRAWING SAID STEEL AFTER A SHORT PERIOD OF TIME IN THE NEIGHBORHOOD OF 1/2 TO 2 1/2 MINUTES, RINSING, DIPPING THE STEEL IN A DILUTE SULPHURIC ACID BATH AND AGAIN RINSING BEFORE CHROMIUM PLATING SAID STEEL AND WITHOUT FURTHER PROCESSING SAID STEEL BRIGHT CHROMIUM PLATING THE SAME.
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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) | 1964-02-28 | 1964-08-29 | 1965-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-28 | 1968-08-29 | 1969-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-28 | 1972-08-29 | 1973-02-28 | $7700.00 | Window Closed / Lapsed |