US4600798A
Expired / Lapsed
US
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Aryl-diethers
Assignee: General Electric Co
•
Filing: 1985-03-18
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Granted: 1986-07-15
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Expires: 2005-03-18
Abstract
Abstract Aryl-diethers are provided which are produced by reacting a halogenated xylene compound, preferably 4-chloro-ortho-xylene, and an alkali metal salt of a bisphenol compound, preferably bisphenol-A. These aryl-diethers serve as precursors in a process for producing polyetherimide polymers.
Inventors
- 👤 James A. Cella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:15
CPC Classifications
C; C07; C07C; C07C43/00; C07C43/02; C07C43/257; C07C43/275; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1046; C08G73/1053; C08G73/1057; C08G73/1064; C08G73/1067; C08G73/1071
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
16 words
An aryl-diether of the formula ##STR11## wherein y is a whole number from 1 to 5.
Claim 2
Dependent Claim
16 words
An aryl-diether of the formula ##STR11## wherein y is a whole number from 1 to 5.
Claim 3
Dependent Claim
12 words
An aryl-diether of a formula selected from the group consisting of ##STR12##
Claim 4
Dependent Claim
12 words
An aryl-diether of a formula selected from the group consisting of ##STR12##
Claim 5
Dependent Claim
49 words
An aryl-diether of claim 2 obtained by reacting a halogenated xylene of a formula selected from the group consisting of ##STR13## and an alkali metal salt of bisphenol-A having the formula ##STR14## where Q is halogen and M is an alkali metal in the presence of a copper catalyst.
Claim 6
Dependent Claim
29 words
An aryl-diether of claim 3 wherein Q is selected from the group consisting of chlorine and bromine and M is selected from the group consisting of sodium and potassium.
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) | 1989-07-14 | 1990-01-13 | 1990-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-14 | 1994-01-13 | 1994-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-14 | 1998-01-13 | 1998-07-15 | $7700.00 | Window Closed / Lapsed |