US3567808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of low density-high strength carbon
Assignee: Airco Inc
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Filing: 1969-11-18
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Granted: 1971-03-02
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Expires: 1989-11-18
Abstract
Abstract THE PRODUCTION OF LOW DENSITY, HIGH STRENGTH CARBON ARTICLES USING AMMONIUM LIGNIN SULFONATE, COCONUT SHELL PARTICLES, AND PITCH BINDERS AS BASIC STARTING MATERIALS.
Inventors
- 👤 Mark J Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:23
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/528; C04B35/532; C01; C01B; C01B32/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |