US3792155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for increasing the carbon yield of indene-derived carbon precursors
Assignee: United States Atomic Energy Commission
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Filing: 1972-04-27
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Granted: 1974-02-12
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Expires: 1992-04-27
Abstract
Abstract THE CARBON YEILD OF CARBON PRECURSORS IS SUBSTANTIALLY INCREASED AND THE MICROSTRUCTURE OF GRAPHITE PREPARED FROM THIS CARBON IS REPRODUCIBLY CONTROLLED BY THE ADDITION OF SELECTED QUANTITIES OF PYROMELLITIC DIANHYDRIDE TO THE CARBON PRECURSORS. D R A W I N G
Inventors
- 👤 W Smith
- 👤 O Horne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:30
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/528; C04B35/532; C01; C01B; C01B32/00; C01B32/20; C01B32/205; H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/58; H01M4/583; H01M4/587
Claims Analysis
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References Cited (Backward Citations)
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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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |