US2638426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for heat-treating metals having difficultly reducible oxides
Assignee: United States Department of the Navy
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Filing: 1949-11-17
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Granted: 1953-05-12
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Expires: 1969-11-17
Abstract
No abstract record available.
Inventors
- 👤 Porter H Brace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:52
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/38; C; C22; C22F; C22F1/00; C22F1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
THE PROCESS OF FURNACE TREATING A METAL WORKPIECE COMPRISING THE STEPS OF DEGASSING THE PIECE BY EVACUATION OF THE FURNACE TO A FEW MICRONS OF MERCURY PRESSURE UNDER MODERATE HEATING FROM 100* TO 300* C., INTRODUCING A HIGHLY PURIFIED HYDROGEN ATMOSPHERE TO A FEW CENTIMETERS OF MERCURY PRESSURE, BENEFICIATING SAID ATMOSPHERE BY VAPORIZING METALLIC CHROMIUM CONTAINED IN SAID FURNACE UNDER HEATING FROM 1200* TO 1400* C., AND THEN HEATING THE WORKPIECE TO ACCOMPLISH THE DESIRED FURNACE TREATMENT THEREOF, THE HIGHLY PURIFIED BENEFICIATED HYDROGEN ATMOSPHERE OPERATING TO PREVENT THE FORMATION OF A TARNISH OR OXIDE FILM UPON THE WORKPIECE.
Claim 2
Dependent Claim
98 words
THE PROCESS OF FURNACE TREATING A METAL WORKPIECE COMPRISING THE STEPS OF DEGASSING THE PIECE BY EVACUATION OF THE FURNACE TO A FEW MICRONS OF MERCURY PRESSURE UNDER MODERATE HEATING FROM 100* TO 300* C., INTRODUCING A HIGHLY PURIFIED HYDROGEN ATMOSPHERE TO A FEW CENTIMETERS OF MERCURY PRESSURE, BENEFICIATING SAID ATMOSPHERE BY VAPORIZING METALLIC CHROMIUM CONTAINED IN SAID FURNACE UNDER HEATING FROM 1200* TO 1400* C., AND THEN HEATING THE WORKPIECE TO ACCOMPLISH THE DESIRED FURNACE TREATMENT THEREOF, THE HIGHLY PURIFIED BENEFICIATED HYDROGEN ATMOSPHERE OPERATING TO PREVENT THE FORMATION OF A TARNISH OR OXIDE FILM UPON THE WORKPIECE.
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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) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |