US3947555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the reclamation of uncemented tungsten carbide powders
Assignee: GTE Sylvania Inc
•
Filing: 1973-10-23
•
Granted: 1976-03-30
•
Expires: 1993-10-23
Abstract
Abstract A process suitable for recovering refractory metal carbide values from contaminated uncemented refractory metal carbides containing an iron group metal comprises heating an admixture of the powders of the contaminated refractory metal carbides and glacial acetic acid to the boiling point of the admixture for at least about 30 minutes, the weight of the powders divided by the weight of the acid is less than 5, thereafter removing the resulting carbide solids from the acid and washing the solids with sufficient water to remove the residual acid and drying the solids.
Inventors
- 👤 Martin B. MacInnis
- 👤 Clarence D. Vanderpool
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:20
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/949
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
82 words
A process suitable for recovering refractory metal carbides comprising: a. forming an admixture containing uncemented tungsten carbide powder contaminated with at least one iron group metal and glacial acetic acid wherein the weight of said powders divided by the weight of said acid is a numerical value less than about 5; b. maintaining said admixture at its boiling point for at least about 30 minutes; c. separating the resulting solids from said acid; and d. removing the residual acid from said solids.
Claim 2
Dependent Claim
82 words
A process suitable for recovering refractory metal carbides comprising: a. forming an admixture containing uncemented tungsten carbide powder contaminated with at least one iron group metal and glacial acetic acid wherein the weight of said powders divided by the weight of said acid is a numerical value less than about 5; b. maintaining said admixture at its boiling point for at least about 30 minutes; c. separating the resulting solids from said acid; and d. removing the residual acid from said solids.
Claim 3
Dependent Claim
17 words
A process according to claim 1 wherein said numerical value is from about 0.05 to about 0.15.
Claim 4
Dependent Claim
18 words
A process according to claim 1 wherein said boiling point is maintained for about 1 to 5 hours.
Claim 5
Dependent Claim
13 words
A process according to claim 3 wherein said carbide is contaminated with cobalt.
References Cited (Backward Citations)
US3438730A
Cited
US3786133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |