US2537035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coating stainless steel
Assignee: Armco Inc
•
Filing: 1945-05-29
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Granted: 1951-01-09
•
Expires: 1965-05-29
Abstract
No abstract record available.
Inventors
- 👤 Irvine C Clingan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:27
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/70; C23C22/72
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
IN THE BLACKENING OF ARTICLES AND PRODUCTS CONTAINING AT LEAST 10% CHROMIUM, THE ART WHICH INCLUDES, TREATING THE ARTICLES OR PRODUCTS IN A MOLTEN SALT BATH ESSENTIALLY CONSISTING OF SALTS OF THE GROUP CONSISTING OF SODIUM DICHROMATE AND POTASSIUM DICHROMATE, AND CIRCULATING GAS CONTAINING FREE OXYGEN THROUGH THE BATH DURING SUCH TREATMENT.
Claim 2
Dependent Claim
52 words
IN THE BLACKENING OF ARTICLES AND PRODUCTS CONTAINING AT LEAST 10% CHROMIUM, THE ART WHICH INCLUDES, TREATING THE ARTICLES OR PRODUCTS IN A MOLTEN SALT BATH ESSENTIALLY CONSISTING OF SALTS OF THE GROUP CONSISTING OF SODIUM DICHROMATE AND POTASSIUM DICHROMATE, AND CIRCULATING GAS CONTAINING FREE OXYGEN THROUGH THE BATH DURING SUCH TREATMENT.
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) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |