Patent US2763480A successfully refreshed from Google Patents.
US2763480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing refractory metals
Assignee: NL Industries Inc
•
Filing: 1950-07-28
•
Granted: 1956-09-18
•
Expires: 1970-07-28
Abstract
No abstract record available.
Inventors
- 👤 Jr Douglas Vern Keller
- 👤 Shaw William Earl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:41
CPC Classifications
C; C22; C22B; C22B34/00; F; F27; F27B; F27B17/00; Y; Y10; Y10S; Y10S266/00; Y10S266/905
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US493047A
Cited
US626626A
Cited
US1226496A
Cited
US1463970A
Cited
US1803135A
Cited
US1830686A
Cited
US1833739A
Cited
US2061250A
Cited
US2085450A
Cited
US2486475A
Cited
US2556763A
Cited
US2564337A
Cited
US2586134A
Cited
US2616800A
Cited
US2663634A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-18 | 1960-03-19 | 1960-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-18 | 1964-03-19 | 1964-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-18 | 1968-03-19 | 1968-09-18 | $7700.00 | Window Closed / Lapsed |