US3594455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods for manufacturing carbon and/or graphite materials
Assignee: Individual
•
Filing: 1969-07-02
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Granted: 1971-07-20
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Expires: 1989-07-02
Abstract
Abstract CARBON AND/OR GRAPHITE MATERIALS HAVING HIGH DENSITY AND MECHANICAL STRENGTH ARE PREPARED BY IMPREGNATION OF A SOLID CARBONACEOUS MATERIAL WITH A SOLUTION OF A CHEMICALLY ACTIVE COMPOUND WHICH IS AN INORGANIC COMPOUND CONTAINING NICKEL, MANGANESE, BARIUM, SULFUR OR NO3, NO2, CLO3 OR CLO4 GROUPS OR AN ORGANIC COMPOUND CONTAINING NITRO, PHENOL, PEROXIDE OR ACID GROUPS, FOLLOWED BY IMPREGNATION WITH A FLUID CARBONACEOUS MATERIAL, E.G. COAL TAR PITCH, AND HEAT TREATMENT.
Inventors
- 👤 Boris Vasilievich Polovoi
- 👤 Jury Ivanovich Barkov
- 👤 Ivan Fedorovich Sukhorukov
- 👤 Stanislav Gavrilovich Rodionov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:32
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/521; 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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |