US3950428A
Expired / Lapsed
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Aromatic polymers
Assignee: Imperial Chemical Industries Ltd
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Filing: 1974-12-19
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Granted: 1976-04-13
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Expires: 1994-12-19
Abstract
Abstract New aromatic polymers comprising units of the formula ##SPC1## And copolymers comprising such units or other units such as ##SPC2## The new polymer may be made from the alkali metal salt of a halophenol of the formula ##SPC3##
Inventors
- 👤 Ronald George Feasey
- 👤 John Brewster Rose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:02
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
A halophenol of the formula ##SPC20## (where X is halogen) or an alkali metal salt thereof.
Claim 2
Dependent Claim
16 words
A halophenol of the formula ##SPC20## (where X is halogen) or an alkali metal salt thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-13 | 1979-10-13 | 1980-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-13 | 1983-10-13 | 1984-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-13 | 1987-10-13 | 1988-04-13 | $7700.00 | Window Closed / Lapsed |