US3749700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Poly(phenylenecarbides)
Assignee: Shell USA Inc
•
Filing: 1970-07-06
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Granted: 1973-07-31
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Expires: 1990-07-06
Abstract
Abstract POLY(O-PHENYLENECARBIDE) AND POLY(M-PHENYLENECARBIDE) ARE NOVEL POLYMERS. THEY ARE FUSIBLE, SOLUBLE IN A VARIETY OF SOLVENTS, AND ARE ALSO CONVERTIBLE BY THERMAL TREATMENT AT AN ELEVATED TEMPERATURE TO A CARBON STRUCTURE WHICH IS DIMENSIONALLY STABLE AND EXTREMELY RESISTANT TO LOSS OF WEIGHT AT TEMPERATURES AS HIGH AS 1000*C. THESE NOVEL POLYMERS ARE CAPABLE OF DISSOLVING LARGE AMOUNTS OF COMPOUNDS OF CERTAIN TRANSITION METALS. UPON THERMAL TREATMENT, SUCH SOLID SOLUTIONS PROVIDE A CARBON STRUCTURE HAVING METAL COMPOUND HOMOGENEOUSLY DISTRIBUTED THEREIN AS SUBMICROSCOPIC PARTICLES.
Inventors
- 👤 R Stephens
- 👤 W Kray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:10
CPC Classifications
C; C08; C08L; C08L65/00; C08G; C08G61/00; C08G61/02
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) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |