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US2621218A
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Electric graphitizing furnace
Assignee: Dow Chemical Co
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Filing: 1951-06-06
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Granted: 1952-12-09
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Expires: 1971-06-06
Abstract
No abstract record available.
Inventors
- 👤 Paul R Juckniess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:03
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C01; C01B; C01B32/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1443581A
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US925902A
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US1411537A
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US2279511A
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US2513778A
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US2519250A
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US2534518A
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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) | 1955-12-09 | 1956-06-09 | 1956-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-09 | 1960-06-09 | 1960-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-09 | 1964-06-09 | 1964-12-09 | $7700.00 | Window Closed / Lapsed |