Patent US2998469A successfully refreshed from Google Patents.
US2998469A
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US
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Electric furnace for melting quartz
Assignee: Osram GmbH
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Filing: 1959-09-11
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Granted: 1961-08-29
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Expires: 1979-09-11
Abstract
No abstract record available.
Inventors
- 👤 Vatterodt Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:44
CPC Classifications
C; C03; C03B; C03B5/00; C03B5/02; C03B5/033; C03B5/0336
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US269760A
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US2650254A
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US853492A
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US1234499A
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US2445457A
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US2445120A
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US2577745A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |