US4837251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dimensionally-stable lightweight core for composite structures
Assignee: United States Department of Energy
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Filing: 1988-02-08
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Granted: 1989-06-06
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Expires: 2008-02-08
Abstract
Abstract A composition for a pressure molded core of a composite structure, including a thermal plastic resin. The composition also includes a component to reduce the coefficient of thermal expansion, a lightweight high compressive strength filler, and a blowing agent. The thermoplastic resin may be polyetheretherketone, the component may be carbon fibers, and the filler may be hollow glass microspheres.
Inventors
- 👤 David W. Okey
- 👤 John S. Church
- 👤 Hossein Saatchi
- 👤 John F. Scanlon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:32
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/35; C08J9/0085
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
64 words
A composition for a pressure molded core of a composite structure, consisting essentially of: a thermoplastic resin selected from the group consisting of polyetheretherketone, polyetherketone, poly arylene sulfide, poly arylene ketone, poly aryl sulfone, and poly aryl ether sulfone; an inorganic fibrous material filler to reduce the coefficient of thermal expansion; an inorganic hollow microsphere filler of high compressive strength; and a blowing agent.
Claim 2
Dependent Claim
64 words
A composition for a pressure molded core of a composite structure, consisting essentially of: a thermoplastic resin selected from the group consisting of polyetheretherketone, polyetherketone, poly arylene sulfide, poly arylene ketone, poly aryl sulfone, and poly aryl ether sulfone; an inorganic fibrous material filler to reduce the coefficient of thermal expansion; an inorganic hollow microsphere filler of high compressive strength; and a blowing agent.
Claim 3
Dependent Claim
11 words
The composition of claim 1 wherein said component comprises carbon fibers.
Claim 4
Dependent Claim
11 words
The composition of claim 1 wherein said component comprises glass fibers.
Claim 5
Dependent Claim
13 words
The composition of claim 1 wherein said hollow microspheres are fabricated of glass.
Claim 6
Dependent Claim
23 words
The composition of claim 1 wherein said microspheres are selected of a group to have on the order of 10,000 psi compressive strength.
References Cited (Backward Citations)
US3536656A
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US4077922A
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US4361453A
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US4363690A
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US4489181A
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US4595623A
Cited
US4692480A
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US4738988A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-05 | 1992-12-05 | 1993-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-05 | 1996-12-05 | 1997-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-05 | 2000-12-05 | 2001-06-06 | $7700.00 | Window Closed / Lapsed |