Patent US3578643A successfully refreshed from Google Patents.
US3578643A
Expired / Lapsed
US
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New polymers from nitrilotriacetonitrile and iminodiacetonitrile
Assignee: WR Grace and Co
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Filing: 1969-06-06
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Granted: 1971-05-11
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Expires: 1989-06-06
Abstract
Abstract POLYMERS OF NITRILOTRIACETONITRILE AND IMINODIACETONITRILE ALONE AND IN COMBINATION HAVE BEEN PREPARED. THESE POLYMERS ON PYROLYSIS YEILD ELECTRICALLY CONDUCTING MATERIALS HAVING THE SAME GENERAL SHAPE AS THE STARTING PREPYROLYZED MATERIAL.
Inventors
- 👤 Louis L Wood
- 👤 Richard A Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:56
CPC Classifications
C; C08; C08G; C08G73/00
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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |