US2678290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of removing surface oxide films on metal
Assignee: Freeport Minerals Co
•
Filing: 1946-09-05
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Granted: 1954-05-11
•
Expires: 1966-09-05
Abstract
No abstract record available.
Inventors
- 👤 Noble James Harvey
- 👤 Pottberg Rolfe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:45
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
PROCESS FOR THE TREATMENT OF SURFACE OXIDE FILMS ON A METAL ARTICLE FOR THE PURPOSE OF REMOVING SURFACE OXIDES THEREFROM COMPRISING PROVIDING A MOLTEN BATH OF THE GROUP CONSISTING OF THE ALKALI METAL HYDROXIDES AND ALKALI METAL CHLORIDES, IMMERSING SAID ARTICLE IN SAID BATH WITHOUT CONNECTION OF SAID ARTICLE OR BATH AS AN ELECTRODE OF AN ELECTRIC SOURCE, INTRODUCING OXYGEN IN GASEOUS FORM FROM AN OUTSIDE SOURCE INTO SAID MOLTEN BATH, SUBJECTING THE SAID SURFACE OXIDES OF SAID IMMERSED ARTICLE TO THE OXIDIZING ACTION OF SAID MOLTEN BATH INTO WHICH SAID OXYGEN IN GASEOUS FROM HAS BEEN INTRODUCED AND CONTAINING SAID OXIDIZING TREATMENT TO THE MOLDIFICATION OF SAID OXIDES TO A FORM EASILY REMOVABLE IN ACIDS.
Claim 2
Dependent Claim
116 words
PROCESS FOR THE TREATMENT OF SURFACE OXIDE FILMS ON A METAL ARTICLE FOR THE PURPOSE OF REMOVING SURFACE OXIDES THEREFROM COMPRISING PROVIDING A MOLTEN BATH OF THE GROUP CONSISTING OF THE ALKALI METAL HYDROXIDES AND ALKALI METAL CHLORIDES, IMMERSING SAID ARTICLE IN SAID BATH WITHOUT CONNECTION OF SAID ARTICLE OR BATH AS AN ELECTRODE OF AN ELECTRIC SOURCE, INTRODUCING OXYGEN IN GASEOUS FORM FROM AN OUTSIDE SOURCE INTO SAID MOLTEN BATH, SUBJECTING THE SAID SURFACE OXIDES OF SAID IMMERSED ARTICLE TO THE OXIDIZING ACTION OF SAID MOLTEN BATH INTO WHICH SAID OXYGEN IN GASEOUS FROM HAS BEEN INTRODUCED AND CONTAINING SAID OXIDIZING TREATMENT TO THE MOLDIFICATION OF SAID OXIDES TO A FORM EASILY REMOVABLE IN ACIDS.
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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) | 1957-05-10 | 1957-11-09 | 1958-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-10 | 1961-11-09 | 1962-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-10 | 1965-11-09 | 1966-05-11 | $7700.00 | Window Closed / Lapsed |