US4468431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyimide composite
Assignee: IML Corp A DE CORP
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Filing: 1983-11-17
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Granted: 1984-08-28
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Expires: 2003-11-17
Abstract
Abstract A composite for use in vibration damping and thermal insulation in aerospace applications formed from a core of a foamed polyimide, with a backing layer bonded to one face of the core. This backing layer to include a thin meal foil bonded to the core with a visco-elastic adhesive. Composite provides superior damping and lower weight and significantly improved fire safety compared with existing products.
Inventors
- 👤 David W. Okey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:51
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/046; B32B15/08; B32B15/20; B32B7/00; B32B7/04; B32B7/12; G; G10; G10K; G10K11/00; G10K11/16; G10K11/162; G10K11/168; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2307/00; B32B2307/70; B32B2307/72; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249982; Y10T428/249985; Y10T428/249987; Y10T428/24999; Y10T428/31504; Y10T428/31721
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
42 words
A composite formed of (a) a core in the form of a foamed polyimide and (b) a backing layer bonded to one face of the core, said backing layer comprising a thin metal foil bonded to the core with a visco-elastic adhesive.
Claim 2
Dependent Claim
42 words
A composite formed of (a) a core in the form of a foamed polyimide and (b) a backing layer bonded to one face of the core, said backing layer comprising a thin metal foil bonded to the core with a visco-elastic adhesive.
Claim 3
Dependent Claim
23 words
A composite as defined in claim 1 wherein the foam has a density within the range of 0.5 to 5 lbs/ft 3 .
Claim 4
Dependent Claim
19 words
A composite as defined in claim 1 wherein the composite also includes a facing layer bonded to the core.
Claim 5
Dependent Claim
15 words
A composite as defined in claim 3 wherein the facing layer is a metal foil.
Claim 6
Dependent Claim
33 words
A composite as defined in claim 1 wherein the polyimide is prepared by foaming a polyimide formed by reaction of an aromatic tetracarboxylic dianhydride or a derivative thereof with one or more diamines.
Claim 7
Dependent Claim
15 words
A composite as defined in claim 5 wherein the anhydride is a benzophenone tetracarboxylic diester.
Claim 8
Dependent Claim
14 words
A composite as defined in claim 1 wherein the adhesive is an acrylic adhesive.
Claim 9
Dependent Claim
15 words
A composite as defined in claim 1 wherein the metal foil is an aluminum foil.
Claim 10
Dependent Claim
19 words
A composite as defined in claim 1 wherein polyimide foam is prepared from the diamines diaminopyridine and methylene dianiline.
Claim 11
Dependent Claim
26 words
A composite as defined in claim 1 which includes a backing layer on each face of the core bonded to the core with a visco-elastic adhesive.
Claim 12
Dependent Claim
18 words
A composite as defined in claim 9 wherein one metal foil includes a strippable protective layer bonded thereto.
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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) | 1987-08-28 | 1988-02-27 | 1988-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-28 | 1992-02-27 | 1992-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-28 | 1996-02-27 | 1996-08-28 | $7700.00 | Window Closed / Lapsed |