US2740709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of purifying refractory metals
Assignee: Titanium Metals Corp
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Filing: 1952-11-24
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Granted: 1956-04-03
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Expires: 1972-11-24
Abstract
No abstract record available.
Inventors
- 👤 Schuyler A Herres
- 👤 Ernest G Kendall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:58
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/14; C22B34/12; C22B34/1295
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A PROCESS FOR PURIFYING A REFRACTORY METAL CONTAMINATED WITH A REDUCING METAL AND A HALIDE OF SAID REDUCING METAL WHICH COMPRISES; COMMINUTING SAID METAL TO A PARTICLE SIZE OF LESS THAN ABOUT 4 MESH, WASHING SAID COMMINUTED METAL, WITHOUT INTERMEDIATE ACID TREATMENT, EMPLOYING A SPRAY OF EXCESS WATER THEREBY TO DISSOLVE REDUCING METAL CHLORIDE AND TO MAINTAIN THE TEMPEATURE OF SAID REFRACTORY METAL BELOW ABOUT 30* F., SUBSEQUENTLY IMMERSING SAID WASHED METAL IN AN AQUEOUS ACID SOLUTION UNTIL THE REDUCING METAL IS DISSOLVED, SAID ACID SOLUTION BEING OF SUCH STRENGTH AND IN AMOUNT THAT THE HYDROGEN ION CONTENT OF THE SPENT ACID AFTER TREATMENT OF THE METAL IS NOT LOWER THAN 0.1 GRAM PER LITER, AND RINSING AND DRYING SAID METAL.
Claim 2
Dependent Claim
121 words
A PROCESS FOR PURIFYING A REFRACTORY METAL CONTAMINATED WITH A REDUCING METAL AND A HALIDE OF SAID REDUCING METAL WHICH COMPRISES; COMMINUTING SAID METAL TO A PARTICLE SIZE OF LESS THAN ABOUT 4 MESH, WASHING SAID COMMINUTED METAL, WITHOUT INTERMEDIATE ACID TREATMENT, EMPLOYING A SPRAY OF EXCESS WATER THEREBY TO DISSOLVE REDUCING METAL CHLORIDE AND TO MAINTAIN THE TEMPEATURE OF SAID REFRACTORY METAL BELOW ABOUT 30* F., SUBSEQUENTLY IMMERSING SAID WASHED METAL IN AN AQUEOUS ACID SOLUTION UNTIL THE REDUCING METAL IS DISSOLVED, SAID ACID SOLUTION BEING OF SUCH STRENGTH AND IN AMOUNT THAT THE HYDROGEN ION CONTENT OF THE SPENT ACID AFTER TREATMENT OF THE METAL IS NOT LOWER THAN 0.1 GRAM PER LITER, AND RINSING AND DRYING SAID METAL.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |