Patent US4057569A successfully refreshed from Google Patents.
US4057569A
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Bisorthodinitriles
Assignee: United States Department of the Navy
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Filing: 1976-04-28
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Granted: 1977-11-08
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Expires: 1996-04-28
Abstract
Abstract Compounds of the general formula: <IMAGE> +tr <IMAGE> wherein R1 is selected from the class consisting of <IMAGE> R2 is an isomer of an aromatic dialdehyde selected from the class consisting of phthalaldehyde, naphthalene dialdehyde, phenanthrene dialdehyde, anthracene dialdehyde, biphenyl dialdehyde, terphenyl dialdehyde; and mixtures thereof and R3 is an isomer of an aromatic diamine selected from the class consisting of benzene diamine, naphthalene diamine, phenanthrene diamine, biphenyl diamine, and terphenyl diamine, and the cyano-condensation resins thereof which are useful in preparing semiconductors.
Inventors
- 👤 James R. Griffith
- 👤 Jacques G. O'Rear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:35
CPC Classifications
C; C07; C07C; C07C255/00; C08; C08G; C08G73/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
17 words
A bisorthodinitrile of the general formula: ##STR14## wherein R is selected from the class consisting of ##STR15##
Claim 2
Dependent Claim
17 words
A bisorthodinitrile of the general formula: ##STR14## wherein R is selected from the class consisting of ##STR15##
Claim 3
Dependent Claim
9 words
The bisorthodinitrile of claim 1 wherein R is ##STR16##
Claim 4
Dependent Claim
9 words
The bisorthodinitrile of claim 1 wherein R is ##STR17##
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) | 1980-11-07 | 1981-05-09 | 1981-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-07 | 1985-05-09 | 1985-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-07 | 1989-05-09 | 1989-11-08 | $7700.00 | Window Closed / Lapsed |