Patent US5070182A successfully refreshed from Google Patents.
US5070182A
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Polyimide resin and insulating film for electric and electronic devices
Assignee: Nissan Chemical Corp
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Filing: 1990-04-26
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Granted: 1991-12-03
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Expires: 2010-04-26
Abstract
Abstract A polyimide resin having a repeating unit of the formula: ##STR1## wherein R 1 is a tetravalent organic group constituting a tetracarboxylic acid or its derivative, wherein four atoms directly bonded to the four carbonyl groups are carbon atoms having no unsaturated bond, and R 2 is a bivalent organic group constituting a diamine.
Inventors
- 👤 Noriaki Kohtoh
- 👤 Takashi Kobayashi
- 👤 Masahiko Yukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:42
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1042; C08G73/1046; C08G73/105; C08G73/1057; C08G73/1064; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/303; H01B3/306; H10; H10D; H10D64/00; H10D64/60; H10D64/66; H10D64/68; H10W; H10W42/00; H10W42/20; H10W42/25; H10W74/00; H10W74/40; H10W74/47; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31721
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
80 words
A polyimide insulating film for an electric or electronic device formed of repeating units of the formula: ##STR5## wherein R is a bivalent organic group selected from the group consisting of ##STR6## wherein X is a hydrogen atom, an alkyl group, an acyl group, an alkoxy group or a halogen atom, or a bivalent organic group derived from a diamine selected from the group consisting of p-phenylenediamine, m-phenylenediamine, diaminodiphenylmethane, diaminodiphenyl ether, 2,2-diaminodiphenylpropane, diaminodiphenylsulfone, diaminobenzophenone, diaminonaphthalene, 1,3-bis(4-aminophenoxy)benzene, 1,4-bis(4-aminophenoxy)benzene,4,4'-di(4-aminophenoxy)diphenylsulfone,2,2'-bis[4-(4-aminophenoxy)phenyl]propane, and mixtures thereof.
Claim 2
Dependent Claim
80 words
A polyimide insulating film for an electric or electronic device formed of repeating units of the formula: ##STR5## wherein R is a bivalent organic group selected from the group consisting of ##STR6## wherein X is a hydrogen atom, an alkyl group, an acyl group, an alkoxy group or a halogen atom, or a bivalent organic group derived from a diamine selected from the group consisting of p-phenylenediamine, m-phenylenediamine, diaminodiphenylmethane, diaminodiphenyl ether, 2,2-diaminodiphenylpropane, diaminodiphenylsulfone, diaminobenzophenone, diaminonaphthalene, 1,3-bis(4-aminophenoxy)benzene, 1,4-bis(4-aminophenoxy)benzene,4,4'-di(4-aminophenoxy)diphenylsulfone,2,2'-bis[4-(4-aminophenoxy)phenyl]propane, and mixtures thereof.
Claim 3
Independent Claim
89 words
A method of insulating an electric or electronic device, comprising: insulating said device with a polyimide film formed from repeating units of the formula: ##STR7## wherein R is a bivalent organic group selected from the group consisting of ##STR8## wherein X is a hydrogen atom, an alkyl group, an acyl group, an alkoxy group or a halogen atom, or a bivalent organic group derived from a diamine selected from the group consisting of p-phenylenediamine, m-phenylenediamine, diaminodiphenylmethane, diaminodiphenyl ether, 2,2-diaminodiphenylpropane, diaminodiphenylsulfone, diaminobenzophenone, diaminonaphthalene, 1,3-bis(4-aminophenoxy)benzene, 1,4-bis(4-aminophenoxy) benzene,4,4'-di(4-aminophenoxy)diphenylsulfone, 2,2'-bis[4-(4-aminophenoxy)phenyl]propane, and mixtures thereof.
Claim 4
Independent Claim
89 words
A method of insulating an electric or electronic device, comprising: insulating said device with a polyimide film formed from repeating units of the formula: ##STR7## wherein R is a bivalent organic group selected from the group consisting of ##STR8## wherein X is a hydrogen atom, an alkyl group, an acyl group, an alkoxy group or a halogen atom, or a bivalent organic group derived from a diamine selected from the group consisting of p-phenylenediamine, m-phenylenediamine, diaminodiphenylmethane, diaminodiphenyl ether, 2,2-diaminodiphenylpropane, diaminodiphenylsulfone, diaminobenzophenone, diaminonaphthalene, 1,3-bis(4-aminophenoxy)benzene, 1,4-bis(4-aminophenoxy) benzene,4,4'-di(4-aminophenoxy)diphenylsulfone, 2,2'-bis[4-(4-aminophenoxy)phenyl]propane, and mixtures thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-12-02 | 1995-06-03 | 1995-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-02 | 1999-06-03 | 1999-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-02 | 2003-06-03 | 2003-12-03 | $7700.00 | Window Closed / Lapsed |