US2917818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum coated steel having chromium in diffusion layer
Assignee: Motors Liquidation Co
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Filing: 1954-12-29
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Granted: 1959-12-22
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Expires: 1974-12-29
Abstract
No abstract record available.
Inventors
- 👤 Robert F Thomson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:36
CPC Classifications
C; C23; C23C; C23C2/00; C23C2/04; C23C2/12; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/934; Y10S428/935; Y10S428/936; Y10S428/937; Y10S428/939; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/12743; Y10T428/1275; Y10T428/12757; Y10T428/12764; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/12847; Y10T428/12854; Y10T428/12861; Y10T428/12951; Y10T428/12958
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
203 words
A METHOD OF PROVIDING A DUCTILE, OXIDATION-RESISTANT COATING ON A FERROUS METAL ARTICLE, SAID METHOD COMPRISING ELECTROPLATING A LAYER OF CHROMIUM HAVING A THICKNESS OF APPROXIMATELY 0.00025 INCH TO 0.001 INCH ON A FERROUS METAL ARTICLE, THEREAFTER IMMERSING SAID CHROMIUM PLATED FERROUS METAL ARTICLE IN A FUSED SALT BATH HEATED TO A TEMPERATURE OF ABOUT 1280* F. TO 1400* F. AND ACTIVATED BY ALUMINUM IN CONTACT THEREWITH TO FLUX SAID ARTICLE, RETAINING SAID PLATED ARTICLE IN SALT BATH UNTIL THE SURFACE TEMPERATURE OF SAID ARTICLE SUBSTANTIALLY REACHES THE TEMPERATURE OF SAID BATH TO PARTIALLY DIFFUSE THE CHROMIUM INTO THE FERROUS METAL AND TO DISSOLVE OXIDES OF CHROMIUM IN THE SALT, SUBSEQUENTLY IMMERSING SAID PLATED ARTICLE IN A MOLTEN COATING METAL SELECTED FROM THE CLASS CONSISTING OF ALUMINUM AND ALUMINUM BASES ALLOYS HEATED TO A TEMPERATURRE OF ABOUT 1250* F. TO 1325* F., RETAINING SAID ARTICLE IN SAID MOLTEN COATING METAL FOR A PERIOD OF TIME NOT EXCEEDING TEN SECONDS TO THEREBY FORM ON SAID ARTICLE A DUCTILE ALUMINUM-IRONCHROMIUM INTERLAYER HAVING A THICKNESS OF APPROXIMATELY 0.0005 INCH TO 0.002 INCH AND AN ALUMINUM OVERLAY HAVING A THICKNESS BETWEEN ABOUT 0.0005 INCH AND 0.004 INCH, AND REMOVING THE COATED ARTICLE FROM SAID MOLTEN COATING METAL.
Claim 2
Independent Claim
203 words
A METHOD OF PROVIDING A DUCTILE, OXIDATION-RESISTANT COATING ON A FERROUS METAL ARTICLE, SAID METHOD COMPRISING ELECTROPLATING A LAYER OF CHROMIUM HAVING A THICKNESS OF APPROXIMATELY 0.00025 INCH TO 0.001 INCH ON A FERROUS METAL ARTICLE, THEREAFTER IMMERSING SAID CHROMIUM PLATED FERROUS METAL ARTICLE IN A FUSED SALT BATH HEATED TO A TEMPERATURE OF ABOUT 1280* F. TO 1400* F. AND ACTIVATED BY ALUMINUM IN CONTACT THEREWITH TO FLUX SAID ARTICLE, RETAINING SAID PLATED ARTICLE IN SALT BATH UNTIL THE SURFACE TEMPERATURE OF SAID ARTICLE SUBSTANTIALLY REACHES THE TEMPERATURE OF SAID BATH TO PARTIALLY DIFFUSE THE CHROMIUM INTO THE FERROUS METAL AND TO DISSOLVE OXIDES OF CHROMIUM IN THE SALT, SUBSEQUENTLY IMMERSING SAID PLATED ARTICLE IN A MOLTEN COATING METAL SELECTED FROM THE CLASS CONSISTING OF ALUMINUM AND ALUMINUM BASES ALLOYS HEATED TO A TEMPERATURRE OF ABOUT 1250* F. TO 1325* F., RETAINING SAID ARTICLE IN SAID MOLTEN COATING METAL FOR A PERIOD OF TIME NOT EXCEEDING TEN SECONDS TO THEREBY FORM ON SAID ARTICLE A DUCTILE ALUMINUM-IRONCHROMIUM INTERLAYER HAVING A THICKNESS OF APPROXIMATELY 0.0005 INCH TO 0.002 INCH AND AN ALUMINUM OVERLAY HAVING A THICKNESS BETWEEN ABOUT 0.0005 INCH AND 0.004 INCH, AND REMOVING THE COATED ARTICLE FROM SAID MOLTEN COATING METAL.
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) | 1962-12-21 | 1963-06-22 | 1963-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-21 | 1967-06-22 | 1967-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-21 | 1971-06-22 | 1971-12-22 | $7700.00 | Window Closed / Lapsed |