US2852409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for case hardening metals
Assignee: NL Industries Inc
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Filing: 1954-11-03
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Granted: 1958-09-16
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Expires: 1974-11-03
Abstract
No abstract record available.
Inventors
- 👤 William P Roe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:00
CPC Classifications
C; C23; C23C; C23C12/00; C23C12/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A METHOD FOR FORMING A HARD ADHERENET SURFACE ON A REFRACTORY METAL, SELECTED FROM THE GROUP CONSISTING OF TITANIUM AND ZIRCONIUM COMPRISING: EMBEDDING THE REFRACTORY METAL IN A FINELY DIVIDED METALLOID COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE CARBIDES, NITRIDES AND BORIDES OF A METAL OF THE FOURTH GROUP OF THE PERIODIC TABLE, PACKING THE METALLOID COMPOUND TIGHTLY AROUND THE REFRACTORY METAL, AND HEATING THE REFRACTORY METAL THEREIN FOR A PERIOD OF TIME AND AT A TEMPERATURE SUFFICIENT TO EFFECT SOLID STATE DIFFUSION OF A SOLUTE SPECIES OF SAID METALLOID COMPOUND INTO SAID REFRACTORY METAL.
Claim 2
Independent Claim
96 words
A METHOD FOR FORMING A HARD ADHERENET SURFACE ON A REFRACTORY METAL, SELECTED FROM THE GROUP CONSISTING OF TITANIUM AND ZIRCONIUM COMPRISING: EMBEDDING THE REFRACTORY METAL IN A FINELY DIVIDED METALLOID COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE CARBIDES, NITRIDES AND BORIDES OF A METAL OF THE FOURTH GROUP OF THE PERIODIC TABLE, PACKING THE METALLOID COMPOUND TIGHTLY AROUND THE REFRACTORY METAL, AND HEATING THE REFRACTORY METAL THEREIN FOR A PERIOD OF TIME AND AT A TEMPERATURE SUFFICIENT TO EFFECT SOLID STATE DIFFUSION OF A SOLUTE SPECIES OF SAID METALLOID COMPOUND INTO SAID REFRACTORY METAL.
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) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |