Patent US3811989A successfully refreshed from Google Patents.
Patent US2709078A successfully refreshed from Google Patents.
US2709078A
Expired / Lapsed
US
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Apparatus for production of refractory metals
Assignee: NL Industries Inc
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Filing: 1952-07-23
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Granted: 1955-05-24
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Expires: 1972-07-23
Abstract
No abstract record available.
Inventors
- 👤 Carl K Stoddard
- 👤 James L Wyatt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:01
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1263; C22B34/1268; C22B34/1272; F; F27; F27B; F27B17/00; Y; Y10; Y10S; Y10S266/00; Y10S266/905
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
134 words
IN AN APPARATUS FOR PRODUCING A REFRACTORY METAL BY REACTING A TETRACHLORIDE OF A REFRACTORY METAL WITH A REACTANT METAL IN AN OXYGEN FREE ATMOSPHERE: A SECTIONAL AIR-TIGHT REACTION UNIT COMPRISING AN INVERTED CAN-SHAPED REACTOR SHELL; A CAN-SHAPED CONDENSING SHELL ARRANGED WITH ITS OPEN END OPPOSITE THE OPEN END OF SAID REACTOR SHELL; FASTENING MEANS CONSTRUCTED AND ARRANGED TO DETACHABLY FASTEN TOGETHER THE OPPOSED OPEN ENDS OF SAID REACTOR SHELL AND SAID CONDENSING SHELL; REINFORCING MEANS FOR SAID REACTOR SHELL COMPRISING A PLURALITY OF STIFF METAL RIBS SECURED TO THE INNER WALL THEREOF; A REACTION POT IN SAID REINFORCED REACTOR SHELL; AND POT SUPPORTING MEANS CONSTRUCTED AND ARRANGED TO BE MOUNTED IN THE OPEN END OF SAID CONDENSING SHELL AND SUPPORTED BY THE LOWER SHELL, AND TO SUPPORT SAID POT WITHIN SAID REACTOR SHELL.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-23 | 1958-11-22 | 1959-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-23 | 1962-11-22 | 1963-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-23 | 1966-11-22 | 1967-05-24 | $7700.00 | Window Closed / Lapsed |