US2598889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pickling chromium alloys
Assignee: Allegheny Ludlum Steel Corp
•
Filing: 1947-07-18
•
Granted: 1952-06-03
•
Expires: 1967-07-18
Abstract
No abstract record available.
Inventors
- 👤 William E Caugherty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:47
CPC Classifications
C; C23; C23F; C23F3/00; C23F3/04; C23F3/06; C23G; C23G1/00; C23G1/02; C23G1/08; C23G1/085
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A METHOD OF THE CHARACTER DESCRIBED FOR REMOVING SCALE FROM STRAIGHT CHROMIUM ALLOYS TO PROVIDE A BRIGHT SURFACE FINISH WHICH COMPRISES, IMMERSING SUCH ALLOYS IN AN AQUEOUS SOLUTION CONSISTING OF NITRIC ACID AND A UNIVALENT SOLUTIONSOLUBLE ALKALI-METAL FLUORIDE SALT, THE FLUORIDE SALT BEING IN A SUFFICIENT MINIMUM AMOUNT OF ABOUT 1% TO ACT UPON THE SCALE AND MAKE IT SUBJECT TO EFFECTIVE ACTION BY THE NITRIC ACID AND BEING WITHIN A MAXIMUM AMONT SUCH THAT ETCHING OF THE ALLOYS WILL BE SUBSTANTIALLY ELIMINATED AND NOT ABOVE ABOUT 8%, THE NITRIC ACID BEING IN A SUFFICIENT MINIMUM AMOUNT OF ABOUT 5% TO REMOVE THE SCALE AND WITHIN A MAXIMUM AMOUNT OF ABOUT 10%, AND THE PROPORTIONING OF THE FLUORIDE SALT AND NITRIC ACID BEING SUCH THAT A SUBSTANTIALLY COMPLETE REMOVAL OF THE SCALE IS EFFECTED.
Claim 2
Independent Claim
134 words
A METHOD OF THE CHARACTER DESCRIBED FOR REMOVING SCALE FROM STRAIGHT CHROMIUM ALLOYS TO PROVIDE A BRIGHT SURFACE FINISH WHICH COMPRISES, IMMERSING SUCH ALLOYS IN AN AQUEOUS SOLUTION CONSISTING OF NITRIC ACID AND A UNIVALENT SOLUTIONSOLUBLE ALKALI-METAL FLUORIDE SALT, THE FLUORIDE SALT BEING IN A SUFFICIENT MINIMUM AMOUNT OF ABOUT 1% TO ACT UPON THE SCALE AND MAKE IT SUBJECT TO EFFECTIVE ACTION BY THE NITRIC ACID AND BEING WITHIN A MAXIMUM AMONT SUCH THAT ETCHING OF THE ALLOYS WILL BE SUBSTANTIALLY ELIMINATED AND NOT ABOVE ABOUT 8%, THE NITRIC ACID BEING IN A SUFFICIENT MINIMUM AMOUNT OF ABOUT 5% TO REMOVE THE SCALE AND WITHIN A MAXIMUM AMOUNT OF ABOUT 10%, AND THE PROPORTIONING OF THE FLUORIDE SALT AND NITRIC ACID BEING SUCH THAT A SUBSTANTIALLY COMPLETE REMOVAL OF THE SCALE IS EFFECTED.
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) | 1955-06-03 | 1955-12-03 | 1956-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-03 | 1959-12-03 | 1960-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-03 | 1963-12-03 | 1964-06-03 | $7700.00 | Window Closed / Lapsed |