US3247086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for enhancing corrosion resistance of stainless steels and products thereof
Assignee: Colt Industries Operating Corp
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Filing: 1961-05-25
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Granted: 1966-04-19
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Expires: 1981-05-25
Abstract
No abstract record available.
Inventors
- 👤 Goldstein David
- 👤 Moskowitz Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:11
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/34
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
119 words
A METHOD OF PRODUCING A BRIGHT FINISHED STAINLESS STEEL ARTICLE OF ENHANCED PIT CORROSION RESISTANCE COMPRISING COLD WORKING THE ARTICLE TO A DESIRED FINAL FORM AND TO IMPART A DESIRED BRIGHT FINISH, ANNEALING THE WROUGHT ARTICLE AT AN ELEVATED TEMPERATURE AND THEREAFTER COOLING THE ANNEALED ARTICLE IN THE SUBSTANTIAL ABSENCE OF OXYGEN TO A TEMPERATURE BELOW THAT AT WHICH AN OXIDE SCALE IS FORMED ON THE ARTICLE BY EXPOSURE TO AIR, IMMERSING THE ARTICLE IN AN ELECTROLYTIC BATH, IMPOSING UPON THE IMMERSED ARTICLE AN ELECTRICAL CURRENT DENSITY OF FROM ABOUT 5 TO ABOUT 1200 AMPERE SECONDS PER SQUARE FOOT OF ARTICLE SURFACE, AND MAKING THE ARTICLE ANODIC DURING AT LEAST THE TERMINAL PORTION OF ITS IMMERSION IN THE BATH.
Claim 2
Independent Claim
119 words
A METHOD OF PRODUCING A BRIGHT FINISHED STAINLESS STEEL ARTICLE OF ENHANCED PIT CORROSION RESISTANCE COMPRISING COLD WORKING THE ARTICLE TO A DESIRED FINAL FORM AND TO IMPART A DESIRED BRIGHT FINISH, ANNEALING THE WROUGHT ARTICLE AT AN ELEVATED TEMPERATURE AND THEREAFTER COOLING THE ANNEALED ARTICLE IN THE SUBSTANTIAL ABSENCE OF OXYGEN TO A TEMPERATURE BELOW THAT AT WHICH AN OXIDE SCALE IS FORMED ON THE ARTICLE BY EXPOSURE TO AIR, IMMERSING THE ARTICLE IN AN ELECTROLYTIC BATH, IMPOSING UPON THE IMMERSED ARTICLE AN ELECTRICAL CURRENT DENSITY OF FROM ABOUT 5 TO ABOUT 1200 AMPERE SECONDS PER SQUARE FOOT OF ARTICLE SURFACE, AND MAKING THE ARTICLE ANODIC DURING AT LEAST THE TERMINAL PORTION OF ITS IMMERSION IN THE BATH.
Claim 3
Dependent Claim
47 words
A BRIGHT FINISHED, COLD WORKED STAINLESS STEEL ARTICLE WHICH HAS BEEN BRIGHT ANNEALED AND THEREAFTER PROVIDED WITH AN ANODIZED SURFACE OF A REFLECTIVITY SUBSTANTIALLY EQUIVALENT TO THAT OF THE UNANODIZED ARTICLE AND EXHIBITING ENHANCED CHLORIDE PIT CORROSION RESISTANCE AS COMPARED WITH A SIMILAR ARTICLE NOT SO PROVIDED.
Claim 4
Dependent Claim
47 words
A BRIGHT FINISHED, COLD WORKED STAINLESS STEEL ARTICLE WHICH HAS BEEN BRIGHT ANNEALED AND THEREAFTER PROVIDED WITH AN ANODIZED SURFACE OF A REFLECTIVITY SUBSTANTIALLY EQUIVALENT TO THAT OF THE UNANODIZED ARTICLE AND EXHIBITING ENHANCED CHLORIDE PIT CORROSION RESISTANCE AS COMPARED WITH A SIMILAR ARTICLE NOT SO PROVIDED.
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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) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |