Patent US3311554A successfully refreshed from Google Patents.
US3311554A
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Method of preparing w2c containing a fine dispersion of carbon
Assignee: Hughes Tool Co
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Filing: 1964-04-14
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Granted: 1967-03-28
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Expires: 1984-04-14
Abstract
No abstract record available.
Inventors
- 👤 Hugh R Mccurdy
- 👤 John R Van Orsdel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:22
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/949
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
THE METHOD OF CONVERTING MONOTUNGSTEN CARBIDE TO W2C WITH DISPERSED CARBON COMPRISING THE STEPS OF COMPRESSING A CHARGE OF TUNGSTEN CARBIDE POWDER TO AN ULTRAHIGH PRESSURE AND HEATING THE TUNGSTEN CARBIDE POWDER TO A MOLTEN CONDITION WHILE SIMULTANEOUSLY SUBJECTING SAID POWDER TO A PRESSURE IN EXCESS OF 25 KILOBARS, THE PERCENTAGE OF DISPERSED CARBON IN THE RESULTING PRODUCT BEING APPROXIMATELY THAT FORMED BY THE REACTION
Claim 2
Independent Claim
65 words
THE METHOD OF CONVERTING MONOTUNGSTEN CARBIDE TO W2C WITH DISPERSED CARBON COMPRISING THE STEPS OF COMPRESSING A CHARGE OF TUNGSTEN CARBIDE POWDER TO AN ULTRAHIGH PRESSURE AND HEATING THE TUNGSTEN CARBIDE POWDER TO A MOLTEN CONDITION WHILE SIMULTANEOUSLY SUBJECTING SAID POWDER TO A PRESSURE IN EXCESS OF 25 KILOBARS, THE PERCENTAGE OF DISPERSED CARBON IN THE RESULTING PRODUCT BEING APPROXIMATELY THAT FORMED BY THE REACTION
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) | 1970-03-27 | 1970-09-26 | 1971-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-27 | 1974-09-26 | 1975-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-27 | 1978-09-26 | 1979-03-28 | $7700.00 | Window Closed / Lapsed |