US2949390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of protecting tantalum crucibles against reaction with molten uranium
Assignee: Individual
•
Filing: 1957-08-07
•
Granted: 1960-08-16
•
Expires: 1977-08-07
Abstract
No abstract record available.
Inventors
- 👤 Harold M Feder
- 👤 Norman R Chellew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:09
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06; C23C8/08; C23C8/60; C23C8/62; C23C8/68
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A PROCESS OF PROTECTING THE INNER SURFACE OF A CRUCIBLE OF TANTALUM METAL AGAINST THE REACTION WITH MOLTEN URANIUM WITH A WELL-SEALING AND WELL-ADHERING COATING OF TANTALUM MONOBORIDE, COMPRISING CONTACTING SAID INNER SURFACE WITH METALLIC BORON AT ABOUT 1800*C. IN A VACUUM WHEREBY A LAYER OF TANTALUM BORIDE IS FORMED ON SAID SURFACE OF SAID CRUCIBLE, DISCONTINUING SAID CONTACT WITH THE BORON, AND HEATING SAID BORIDE CRUCIBLE TO FROM 1800 TO 2000*C. IN VACUUM WHEREBY THE BORIDE IS CONVERTED TO THE TANTALUM MONOBORIDE.
Claim 2
Dependent Claim
83 words
A PROCESS OF PROTECTING THE INNER SURFACE OF A CRUCIBLE OF TANTALUM METAL AGAINST THE REACTION WITH MOLTEN URANIUM WITH A WELL-SEALING AND WELL-ADHERING COATING OF TANTALUM MONOBORIDE, COMPRISING CONTACTING SAID INNER SURFACE WITH METALLIC BORON AT ABOUT 1800*C. IN A VACUUM WHEREBY A LAYER OF TANTALUM BORIDE IS FORMED ON SAID SURFACE OF SAID CRUCIBLE, DISCONTINUING SAID CONTACT WITH THE BORON, AND HEATING SAID BORIDE CRUCIBLE TO FROM 1800 TO 2000*C. IN VACUUM WHEREBY THE BORIDE IS CONVERTED TO THE TANTALUM MONOBORIDE.
References Cited (Backward Citations)
US1968067A
Cited
US1991977A
Cited
US2199125A
Cited
US2275952A
Cited
US2369146A
Cited
US2766110A
Cited
US2789897A
Cited
US2665997A
Cited
US2665475A
Cited
US2720474A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-16 | 1964-02-15 | 1964-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-16 | 1968-02-15 | 1968-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-16 | 1972-02-15 | 1972-08-16 | $7700.00 | Window Closed / Lapsed |