Patent US2848523A successfully refreshed from Google Patents.
US2848523A
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US
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Vacuum crucible furnace
Assignee: Stauffer Chemical Co
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Filing: 1956-07-27
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Granted: 1958-08-19
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Expires: 1976-07-27
Abstract
No abstract record available.
Inventors
- 👤 Charles W Hanks
- 👤 Charles D A Hunt
- 👤 Jr Hugh R Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:36
CPC Classifications
B; B01; B01J; B01J6/00; B01J6/005; B01J3/00; B01J3/006; C; C22; C22B; C22B9/00; C22B9/16; C22B9/22; C22B9/228
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2238799A
Cited
US1617359A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-18 | 1962-02-17 | 1962-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-18 | 1966-02-17 | 1966-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-18 | 1970-02-17 | 1970-08-19 | $7700.00 | Window Closed / Lapsed |