US3644570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of rubber modified novolak resins
Assignee: BP Chemicals Ltd
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Filing: 1969-09-24
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Granted: 1972-02-22
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Expires: 1989-09-24
Abstract
Abstract RUBBER MODIFIED PHENOLIC RESOLE AND NOVOLAK RESINS ARE PREPARED BY REACTING THE PHENOL AND ALDEHYDE UNDER THE APPROPRIATE REACTION CONDITIONS IN THE PRESENCE OF A LATEX OF A POLYCHLOROPRENE RUBBER.
Inventors
- 👤 Kerry David Jeffreys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:03
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/38
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) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |