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Patent US5089593A successfully refreshed from Google Patents.
US5089593A
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Polyimide containing 4,4'-bis(4-amino-2-trifluoromethylphenoxy)-biphenyl moieties
Assignee: Texas A&M University System
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Filing: 1989-12-22
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Granted: 1992-02-18
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Expires: 2009-12-22
Abstract
Abstract Polyimides useful in multilayer electronic devices containing the 4,4'-bis(4-amino-2-trifluoromethylphenoxy) biphenyl moiety have low dielectric constants, low moisture uptake, high thermal degradation stability, low glass transition temperature.
Inventors
- 👤 Douglas E. Fjare
- 👤 Neal R. Nowicki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:17
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1042; C08G73/1046; C08G73/105; C08G73/1067; C08G73/1071; C09; C09D; C09D179/00; C09D179/04; C09D179/08; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/303; H01B3/306; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0346; H10; H10P; H10P14/00; H10P14/60; H10P14/63; H10P14/6326; H10P14/6342; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31721
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
18 words
A polyimide composition comprising recurring units of ##STR4## wherein Ar is selected from the group consisting of ##STR5##
Claim 2
Dependent Claim
18 words
A polyimide composition comprising recurring units of ##STR4## wherein Ar is selected from the group consisting of ##STR5##
Claim 3
Dependent Claim
9 words
A polyimide solution containing the polymer of claim 1.
Claim 4
Dependent Claim
20 words
A structure comprising at least one substrate coated with at least one layer of the polyimide composition of claim 1.
Claim 5
Dependent Claim
16 words
The structure of claim 3 having two or more layers of the polyimide of claim 1.
Claim 6
Dependent Claim
46 words
A polymer composition comprising recurring units of ##STR6## wherein R 1 and R 2 are independently selected from halogen, --OH, and --OR 3 where R 3 is an alkyl group 1 to 4 carbon atoms; and wherein Ar is selected from the group consisting of ##STR7##
Claim 7
Dependent Claim
46 words
A polymer composition comprising recurring units of ##STR6## wherein R 1 and R 2 are independently selected from halogen, --OH, and --OR 3 where R 3 is an alkyl group 1 to 4 carbon atoms; and wherein Ar is selected from the group consisting of ##STR7##
Claim 8
Dependent Claim
20 words
A structure comprising at least one substrate coated with at least one layer of the polyimide composition of claim 5.
Claim 9
Dependent Claim
16 words
The structure of claim 6 having two or more layers of the polyimide of claim 5.
Claim 10
Dependent Claim
15 words
The polymer composition of claim 5 wherein R 1 and R 2 are each chlorine.
Claim 11
Dependent Claim
9 words
A polyimide solution containing the polymer of claim 5.
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) | 1995-02-17 | 1995-08-19 | 1996-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-17 | 1999-08-19 | 2000-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-17 | 2003-08-19 | 2004-02-18 | $7700.00 | Window Closed / Lapsed |