US3574653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-purity synthetic pitch
Assignee: Union Carbide Corp
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Filing: 1966-07-26
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Granted: 1971-04-13
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Expires: 1986-07-26
Abstract
Abstract A SYNTHETIC PITCH HAVING A SOFTENING POINT IN THE RANGE FROM ABOUT 50*C. TO ABOUT 250*C. AND COMPRISING ACENAPHTHENE AND COMPLEX AROMATIZED PYROLYSIS PRODUCTS OF ACENAPHTHYLENE POLYMERS IS PRODUCED BY HEATING ACENAPHTHYLENE TO FORM A SOLID POLYMERIC MIXTURE, AND THEN FURTHER HEATING THE SOLID MIXTURE SO PRODUCED TO CAUSE IT TO LIWUEFY AND REFLUX TO PRODUCE SAID PITCH BY PYROLYSIS OF THE POLYMERS.
Inventors
- 👤 Theodore Edstrom
- 👤 Irwin C Lewis
- 👤 Charles V Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:31
CPC Classifications
C; C10; C10C; C10C3/00
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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |