US4638072A
Expired / Lapsed
US
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Disubstituted maleic anhydride compounds
Assignee: BP Corp North America Inc
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Filing: 1985-12-11
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Granted: 1987-01-20
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Expires: 2005-12-11
Abstract
Abstract Di-substituted maleic anhydride compounds are disclosed of the structural formula <IMAGE> wherein R and R1 are selected from the group consisting of aliphatic and phenyl moieties, and R2 is a divalent aromatic moiety. Polyamide-imide polymers, polyimide polymers and vinyl copolymers derived therefrom are also disclosed.
Inventors
- 👤 Ellis K. Fields
- 👤 Mark L. Winzenburg
- 👤 Steven J. Behrend
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:53
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/34; C07C; C07C63/00; C07C63/33; C07C63/337; C07C63/42; C07C63/48; C07C63/66; C07C63/68; C07C63/74; C07D405/00; C07D405/02; C07D405/04; C07D409/00; C07D409/02; C07D409/04; C07D409/06; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1046; C08G73/105; C08G73/1057; C08G73/1067; C08G73/12; C08G73/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
30 words
A substituted phenanthrene anhydride compound of the structural formula ##STR40## wherein R 4 and R 5 are individually selected from the group consisting of --NH 2 and --CH═CH 2 .
Claim 2
Dependent Claim
30 words
A substituted phenanthrene anhydride compound of the structural formula ##STR40## wherein R 4 and R 5 are individually selected from the group consisting of --NH 2 and --CH═CH 2 .
Claim 3
Dependent Claim
60 words
A substituted dibenzanthracene dianhydride compound of the structural formula ##STR41## wherein R 4 and R 5 are individually selected from the group consisting of hydrogen, alkyl moieties of 1 to 10 carbon atoms, phenyl moieties, naphthyl moieties, --NO 2 , --NHCOCH 3 , --NH 2 , --OCOCH 3 , --OH, --OCH 3 , --CH═CH 2 , --COOCH 3 and --COOH.
Claim 4
Dependent Claim
60 words
A substituted dibenzanthracene dianhydride compound of the structural formula ##STR41## wherein R 4 and R 5 are individually selected from the group consisting of hydrogen, alkyl moieties of 1 to 10 carbon atoms, phenyl moieties, naphthyl moieties, --NO 2 , --NHCOCH 3 , --NH 2 , --OCOCH 3 , --OH, --OCH 3 , --CH═CH 2 , --COOCH 3 and --COOH.
Claim 5
Dependent Claim
61 words
A substituted dibenzanthracene dianhydride compound of the structural formula ##STR42## wherein R 4 and R 5 are individually selected from the group consisting of hydrogen, alkyl moieties of 1 to 5 carbon atoms, phenyl moieties, naphthyl moieties, --NO 2 , --NHCOCH 3 , --NH 2 , --OCOCH 3 , --OH, --OCH 3 , --CH═CH 2 , --COOCH 3 , and --COOH.
Claim 6
Dependent Claim
61 words
A substituted dibenzanthracene dianhydride compound of the structural formula ##STR42## wherein R 4 and R 5 are individually selected from the group consisting of hydrogen, alkyl moieties of 1 to 5 carbon atoms, phenyl moieties, naphthyl moieties, --NO 2 , --NHCOCH 3 , --NH 2 , --OCOCH 3 , --OH, --OCH 3 , --CH═CH 2 , --COOCH 3 , and --COOH.
References Cited (Backward Citations)
DE3125057A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-19 | 1990-07-21 | 1991-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-19 | 1994-07-21 | 1995-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-19 | 1998-07-21 | 1999-01-20 | $7700.00 | Window Closed / Lapsed |