Patent US5260413A successfully refreshed from Google Patents.
US5260413A
Expired / Lapsed
US
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Coated, heat-sealable aromatic polyimide film having superior compressive strength
Assignee: EIDP Inc
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Filing: 1992-03-12
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Granted: 1993-11-09
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Expires: 2012-03-12
Abstract
Abstract An aromatic polyimide film coated with a thermally stable, heat-sealable thermoplastic polyimide for use as a wire insulation for superconducting magnets is disclosed. The inclusion of inorganic particles in the film improves compressive strength of the coated polyimide film.
Inventors
- 👤 James P. Ochsner
- 👤 Darrell J. Parish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:09
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/303; H01B3/306; C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/31504; Y10T428/31721
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
135 words
A coated polyimide film useful for insulating super-conducting wire, comprising an aromatic polyimide base film derived from an aromatic dianhydride and a diamine wherein said base film contains from 10 to 40 weight % of inorganic particles having a MOH hardness in a range from 4 to 15 with said base film being coated on at least one surface with an adherent layer of a structurally different thermoplastic heat-sealable polyimide; wherein said coated polyimide film has the following properties: (i) a radiation resistance (is present) of at least 10 9 rads, (ii) a compressive strength (is present) of at least 10 Kpsi at 25° C., (iii) the coating heat-sealable at a temperature less than 250° C.; and (iv) adhesion of the base film and coating layer with a bond strength of at least 400 g/in.
Claim 2
Dependent Claim
135 words
A coated polyimide film useful for insulating super-conducting wire, comprising an aromatic polyimide base film derived from an aromatic dianhydride and a diamine wherein said base film contains from 10 to 40 weight % of inorganic particles having a MOH hardness in a range from 4 to 15 with said base film being coated on at least one surface with an adherent layer of a structurally different thermoplastic heat-sealable polyimide; wherein said coated polyimide film has the following properties: (i) a radiation resistance (is present) of at least 10 9 rads, (ii) a compressive strength (is present) of at least 10 Kpsi at 25° C., (iii) the coating heat-sealable at a temperature less than 250° C.; and (iv) adhesion of the base film and coating layer with a bond strength of at least 400 g/in.
Claim 3
Dependent Claim
28 words
The coated film of claim 1 wherein all particles are in a range from 0.3 to 5 micrometers having a hardness in a range from 8 to 15.
Claim 4
Dependent Claim
25 words
The coated film of claim 2 wherein said particle range is from 1 to 2 micrometers and said hardness range is from 12 to 13.
Claim 5
Dependent Claim
14 words
The coated polyimide film of claim 1 wherein said inorganic particles are alumina particles.
Claim 6
Dependent Claim
23 words
The coated polyimide film of claim 4 wherein the alumina particles are present in an amount of from 20 to 35 weight %.
Claim 7
Dependent Claim
19 words
The coated polyimide film of claim 1 wherein said heat-sealable polyimide comprises a product of 4,4'-oxydiphthalic dianhydride and 1,3-(4-aminophenoxy)benzene.
Claim 8
Dependent Claim
32 words
The coated polyimide film of claim 1 wherein said heat-sealable polyimide comprises a product of 1 to 10 mole % pyromellitic dianhydride and 99 to 90 mole % 4,4'-oxydiphthalic dianhydride with 1,3-(4-aminophenoxy)benzene.
Claim 9
Dependent Claim
31 words
The coated polyimide film of claim 1 wherein said heat-sealable polyimide comprises a product of 1 to 10 mole % 3,3',4,4'benzophenone tetracarboxylic dianhydride and 99-90 mole % 4,4'-oxydiphthalic dianhydride with 1,3-(4-aminophenoxy)benzene.
Claim 10
Dependent Claim
33 words
The coated polyimide film of claim 1 wherein said heat-sealable polyimide comprises a product of 4,4'-oxydiphthalic dianhydride with 1 to 10 mole % 4,4'-diaminodiphenyl ether and 99 to 90 mole % 1,3-(4-aminophenoxy) benzene.
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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) | 1996-11-08 | 1997-05-10 | 1997-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-08 | 2001-05-10 | 2001-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-08 | 2005-05-10 | 2005-11-09 | $7700.00 | Window Closed / Lapsed |