US3254955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing a tantalum carbide crystal
Assignee: Individual
•
Filing: 1962-08-28
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Granted: 1966-06-07
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Expires: 1982-08-28
Abstract
No abstract record available.
Inventors
- 👤 George R Bird
- 👤 Brewer Leo
- 👤 Jr Willis E Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:11
CPC Classifications
C; C30; C30B; C30B13/00; C30B13/08; C30B29/00; C30B29/10; C30B29/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A METHOD FOR PRODUCING SINGLE CRYSTALS OF TANTALUM CARBIDE, COMPRISING THE STEPS OF: PREPARING A TWO-COMPONENT COMPOSITION IN A TA-C SYSTEM, A FIRST COMPONENT OF WHICH CONTAINS A SUBSTANTIAL WEIGHT PERCENT OF TANTALUM, AND A SECOND COMPONENT OF WHICH IS CARBON IN THE FORM OF A CRUCIBLE IN WHICH SAID FIRST COMPONENT IS PLACED; AND ZONE MELTING SAID COMPOSITION IN THE TAC-C EUTECTIC COMPOSITION REGION OF THE TA-C SYSTEM.
Claim 2
Independent Claim
69 words
A METHOD FOR PRODUCING SINGLE CRYSTALS OF TANTALUM CARBIDE, COMPRISING THE STEPS OF: PREPARING A TWO-COMPONENT COMPOSITION IN A TA-C SYSTEM, A FIRST COMPONENT OF WHICH CONTAINS A SUBSTANTIAL WEIGHT PERCENT OF TANTALUM, AND A SECOND COMPONENT OF WHICH IS CARBON IN THE FORM OF A CRUCIBLE IN WHICH SAID FIRST COMPONENT IS PLACED; AND ZONE MELTING SAID COMPOSITION IN THE TAC-C EUTECTIC COMPOSITION REGION OF THE TA-C SYSTEM.
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) | 1969-06-06 | 1969-12-06 | 1970-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-06 | 1973-12-06 | 1974-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-06 | 1977-12-06 | 1978-06-07 | $7700.00 | Window Closed / Lapsed |