Patent US4801682A successfully refreshed from Google Patents.
US4801682A
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High temperature fluorinated polymer
Assignee: RTX Corp
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Filing: 1986-05-27
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Granted: 1989-01-31
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Expires: 2006-05-27
Abstract
Abstract High temperature fluorinated polyimides having repeating polymer units comprising ##STR1## wherein X is diamine. Typically, these polyimides are the copolymerization product of about 3 mole % to about 42 mole % nadic esters; about 39 mole % to about 49 mole % diamine; and about 17 mole % to about 48 mole % 4,4'9(2,2,2-trifluoro-1-phenylethylidene)-bipthalic tetra carboxylic acid dialkylester. These polimides provide the high strength properties at high temperatures yet they can be processed into solid polymers, fibers, films and composites at low temperatures and pressures.
Inventors
- 👤 Daniel A. Scola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:28
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1039; C08G73/1042
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
15 words
High temperature fluorinated polyimides having repeating polymer units comprising: ##STR16## wherein X is a diamine.
Claim 2
Dependent Claim
15 words
High temperature fluorinated polyimides having repeating polymer units comprising: ##STR16## wherein X is a diamine.
Claim 3
Dependent Claim
15 words
The high temperature fluorinated polyimides as recited in claim 1 wherein X is 4,4'-methylene diphenylene.
Claim 4
Dependent Claim
50 words
High temperature fluorinated polyimides comprising the copolymerization product of the copolymerization of a. about 3 mole % to about 43 mole % nadic esters; b. about 39 mole % to about 49 mole % diamine; and and c. about 17 mole % to about 48 mole 4,4'(2,2,2-trifluoro-1-phenylethylidene)-bipthalic tetracarboxylic acid dialkylester.
Claim 5
Dependent Claim
50 words
High temperature fluorinated polyimides comprising the copolymerization product of the copolymerization of a. about 3 mole % to about 43 mole % nadic esters; b. about 39 mole % to about 49 mole % diamine; and and c. about 17 mole % to about 48 mole 4,4'(2,2,2-trifluoro-1-phenylethylidene)-bipthalic tetracarboxylic acid dialkylester.
Claim 6
Dependent Claim
20 words
The high temperature fluorinated polyimides as recited in claim 3 wherein the nadic ester is a 5-norbornene-1,2-dicarboxylic acid anhydride monomethylester.
Claim 7
Dependent Claim
16 words
The high temperature fluorinated polyimides as recited in claim 3 wherein the diamine is 4,4'-methylene dianiline.
Claim 8
Dependent Claim
20 words
The high temperature fluorinated polyimides as recited in claim 3 wherein the dialkylester is 4,4'(2,2,2-trifluoro-1-phenyl ethylidene)-biphthalic tetra carboxylic acid dimethylester.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-31 | 1992-08-01 | 1993-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-31 | 1996-08-01 | 1997-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-31 | 2000-08-01 | 2001-01-31 | $7700.00 | Window Closed / Lapsed |