US5061809A
Expired / Lapsed
US
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9,9-bis-(3,4-dicarboxyphenyl)fluorene dianhydrides
Assignee: Air Products and Chemicals Inc
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Filing: 1990-12-26
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Granted: 1991-10-29
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Expires: 2010-12-26
Abstract
Abstract The present invention relates to compositions of matter corresponding to the formula: ##STR1## wherein R 1 through R 4 , inclusive, are independently selected from a hydrogen atom, a linear or branched alkyl or alkoxy group having from 1 to about 8 carbon atoms, an alkenyl group having from 2 to about 8 carbon atoms, amino, cyano or R 1 and R 1 , R 1 and R 2 , R 2 and R 3 or R 3 and R 4 may together form part of a cyclohydrocarbyl ring. The subject 9,9-bis(3,4-dicarboxyphenyl)fluorene dianhydrides demonstrate utility as reactants in the preparation of polyimides used in the fabrication of membranes for separating gaseous mixtures into their respective components.
Inventors
- 👤 Richard O. Angus, Jr.
- 👤 Khalil Yacoub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:15
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1039; B; B01; B01D; B01D71/00; B01D71/06; B01D71/58; B01D71/62; B01D71/64; C08G73/1067
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
88 words
A composition of matter having the structural formula: ##STR5## wherein R 1 through R 4 , inclusive, are independently selected from a hydrogen atom, a linear or branched alkyl or alkoxy group having from 1 to about 8 carbon atoms, a linear or branched alkenyl group having from 2 to about 8 carbon atoms, amino, cyano or R 1 and R 1 , R 1 and R 2 , R 2 and R 3 and R 3 and R 4 may together form part of a cyclohydrocarbyl ring.
Claim 2
Dependent Claim
88 words
A composition of matter having the structural formula: ##STR5## wherein R 1 through R 4 , inclusive, are independently selected from a hydrogen atom, a linear or branched alkyl or alkoxy group having from 1 to about 8 carbon atoms, a linear or branched alkenyl group having from 2 to about 8 carbon atoms, amino, cyano or R 1 and R 1 , R 1 and R 2 , R 2 and R 3 and R 3 and R 4 may together form part of a cyclohydrocarbyl ring.
Claim 3
Dependent Claim
23 words
The composition of matter according to claim 1 wherein the alkyl group is selected from methyl, ethyl, propyl, isopropyl, butyl, isobutyl or tert-butyl.
Claim 4
Dependent Claim
21 words
The composition of matter according to claim 1 wherein the alkenyl group is selected from ethenyl, propenyl, isopropenyl, butenyl or isobutenyl.
Claim 5
Dependent Claim
23 words
The composition of matter according to claim 1 wherein the alkoxy group is selected from methoxy, ethoxy, propoxy, isopropoxy, butoxy, sec-butoxy or tert-butoxy.
Claim 6
Dependent Claim
86 words
A composition of matter having the structural formula: ##STR6## wherein R 1 through R 4 , inclusive, are independently selected from a hydrogen atom, a linear or branched alkyl or alkoxy group having from 1 to about 8 carbon atoms, a linear or branched alkenyl group having from 2 to about 8 carbon atoms or R 1 and R 1 , R 1 and R 2 , R 2 and R 3 and R 3 and R 4 may together form part of a cyclohydrocarbyl ring.
Claim 7
Dependent Claim
86 words
A composition of matter having the structural formula: ##STR6## wherein R 1 through R 4 , inclusive, are independently selected from a hydrogen atom, a linear or branched alkyl or alkoxy group having from 1 to about 8 carbon atoms, a linear or branched alkenyl group having from 2 to about 8 carbon atoms or R 1 and R 1 , R 1 and R 2 , R 2 and R 3 and R 3 and R 4 may together form part of a cyclohydrocarbyl ring.
Claim 8
Dependent Claim
23 words
The composition of matter according to claim 5 wherein the alkyl group is selected from methyl, ethyl, propyl, isopropyl, butyl, isobutyl and tert-butyl.
Claim 9
Dependent Claim
21 words
The composition of matter according to claim 5 wherein the alkenyl group is selected from ethenyl, propenyl, isopropenyl, butenyl and isobutenyl.
Claim 10
Dependent Claim
23 words
The composition of matter according to claim 5 wherein the alkoxy group is selected from methoxy, ethoxy, propoxy, isopropoxy, butoxy, sec-butoxy and tert-butoxy.
Claim 11
Dependent Claim
21 words
The composition of matter according to claim 6 wherein R 1 and R 1 together form part of a cyclohydrocarbyl ring.
Claim 12
Dependent Claim
21 words
The composition of matter according to claim 6 wherein R 1 and R 2 together form part of a cyclohydrocarbyl ring.
Claim 13
Dependent Claim
21 words
The composition of matter according to claim 6 wherein R 2 and R 3 together form part of a cyclohydrocarbyl ring.
Claim 14
Dependent Claim
21 words
The composition of matter according to claim 6 wherein R 3 and R 4 together form part of a cyclohydrocarbyl ring.
Claim 15
Dependent Claim
55 words
A composition of matter having the structural formula: ##STR7## wherein R 1 through R 4 , inclusive, are independently selected from a hydrogen atom, a linear or branched alkyl or alkoxy group having from 1 to about 8 carbon atoms or a linear or branched alkenyl group having from 2 to about 8 carbon atoms.
Claim 16
Dependent Claim
55 words
A composition of matter having the structural formula: ##STR7## wherein R 1 through R 4 , inclusive, are independently selected from a hydrogen atom, a linear or branched alkyl or alkoxy group having from 1 to about 8 carbon atoms or a linear or branched alkenyl group having from 2 to about 8 carbon atoms.
Claim 17
Dependent Claim
23 words
The composition of matter according to claim 13 wherein the alkyl group is selected from methyl, ethyl, propyl, isopropyl, butyl, isobutyl and tert-butyl.
Claim 18
Dependent Claim
21 words
The composition of matter according to claim 13 wherein the alkenyl group is selected from ethenyl, propenyl, isopropenyl, butenyl and isobutenyl.
Claim 19
Dependent Claim
23 words
The composition of matter according to claim 13 wherein the alkoxy group is selected from methoxy, ethoxy, propoxy, isopropoxy, butoxy, sec-butoxy and tert-butoxy.
Claim 20
Dependent Claim
35 words
The composition of matter according to claim 13 wherein R 1 through R 4 are independently selected from a hydrogen atom or a linear or branched alkyl having from 1 to about 8 carbon atoms.
Claim 21
Dependent Claim
25 words
The composition of matter according to claim 17 wherein the linear or branched alkyl is selected from methyl, ethyl, propyl, isopropyl, butyl, isobutyl and tert-butyl.
Claim 22
Dependent Claim
9 words
A composition of matter represented by the formula: ##STR8##
Claim 23
Dependent Claim
9 words
A composition of matter represented by the formula: ##STR8##
References Cited (Backward Citations)
US3522160A
Cited
US3822202A
Cited
US3899309A
Cited
USRE30351E
Cited
US4263209A
Cited
US4378400A
Cited
US4705540A
Cited
US4717393A
Cited
US4717394A
Cited
JPS63190607A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-10-28 | 1995-04-29 | 1995-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-28 | 1999-04-29 | 1999-10-29 | $3760.00 | Window Closed / Lapsed |
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