US2913315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tungsten carbide purification
Assignee: General Electric Co
•
Filing: 1957-02-27
•
Granted: 1959-11-17
•
Expires: 1977-02-27
Abstract
No abstract record available.
Inventors
- 👤 William W Welbon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:41
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/949
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A PROCESS FOR REMOVING FROM IMPURE TUNGSTEN CARBIDE PARTICLES, THE TRACE METALS WHICH REACT WITH MOLTEN ALKALI METAL PYROSULFATES, WHICH COMPRISES CONTACTING THE IMPURE TUNGSTEN CARBIDE WITH A MOLTEN ALKLI METAL PYROSULFATE, THEREBY EXTRACTING THE TRACE METALS INTO THE MOLTEN SALT AND THEREAFTER SEPARATING THE PURIFIED TUNGSTEN CARBIDE FROM THE FUSION MASS.
Claim 2
Dependent Claim
52 words
A PROCESS FOR REMOVING FROM IMPURE TUNGSTEN CARBIDE PARTICLES, THE TRACE METALS WHICH REACT WITH MOLTEN ALKALI METAL PYROSULFATES, WHICH COMPRISES CONTACTING THE IMPURE TUNGSTEN CARBIDE WITH A MOLTEN ALKLI METAL PYROSULFATE, THEREBY EXTRACTING THE TRACE METALS INTO THE MOLTEN SALT AND THEREAFTER SEPARATING THE PURIFIED TUNGSTEN CARBIDE FROM THE FUSION MASS.
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) | 1962-11-16 | 1963-05-18 | 1963-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-16 | 1967-05-18 | 1967-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-16 | 1971-05-18 | 1971-11-17 | $7700.00 | Window Closed / Lapsed |