US2832708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating stainless steel to improve its corrosion resistance
Assignee: Motors Liquidation Co
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Filing: 1955-11-25
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Granted: 1958-04-29
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Expires: 1975-11-25
Abstract
No abstract record available.
Inventors
- 👤 Ellen L Karchner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:23
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/24; C23C22/33
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
A METHOD OF TREATING STAINLESS STEELS WHICH COMPRISES IMMERSING THE STAINLESS STEEL IN AN AQUEOUS SOLUTION CONTAINING ABOUT 3 TO 10% BY WEIGHT CHROMIC ACID AND 2 TO 5% BY WEIGHT COMMERCIAL ORTHOPHOSPHORIC ACID (85% ACID). SAID SOLUTION BEING MAINTAINED AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 170 TO 190*F., LEAVING THE STAINLESS STEEL PART IN SAID SOLUTION FOR A TIME OF ABOUT AT LEAST 10 MINUTES AND THEREAFTER REMOVING THE STAINLESS STEEL PART FROM SAID SOLUTION.
Claim 2
Independent Claim
78 words
A METHOD OF TREATING STAINLESS STEELS WHICH COMPRISES IMMERSING THE STAINLESS STEEL IN AN AQUEOUS SOLUTION CONTAINING ABOUT 3 TO 10% BY WEIGHT CHROMIC ACID AND 2 TO 5% BY WEIGHT COMMERCIAL ORTHOPHOSPHORIC ACID (85% ACID). SAID SOLUTION BEING MAINTAINED AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 170 TO 190*F., LEAVING THE STAINLESS STEEL PART IN SAID SOLUTION FOR A TIME OF ABOUT AT LEAST 10 MINUTES AND THEREAFTER REMOVING THE STAINLESS STEEL PART FROM SAID SOLUTION.
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) | 1961-04-28 | 1961-10-28 | 1962-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-28 | 1965-10-28 | 1966-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-28 | 1969-10-28 | 1970-04-29 | $7700.00 | Window Closed / Lapsed |