US4513055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled thermal expansion composite and printed circuit board embodying same
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1981-11-30
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Granted: 1985-04-23
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Expires: 2001-11-30
Abstract
Abstract A composite characterized by a controlled coefficient of thermal expansion and comprising a thermal coefficient control fabric embedded in a resin matrix and composed of yarns with positive and negative coefficients of thermal expansion. A composite circuit board constructed of the composite and having a coefficient of thermal expansion matched to a particular integrated chip carrier material, such as aluminum oxide.
Inventors
- 👤 Joseph D. Leibowitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:00
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/0366; H05K2201/00; H05K2201/02; H05K2201/0275; H05K2201/0278; H05K2201/029; H05K2201/06; H05K2201/068; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T442/00; Y10T442/30; Y10T442/3179; Y10T442/322; Y10T442/3228; Y10T442/3236; Y10T442/3252
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
70 words
A composite comprising: a resin matrix, a woven thermal expansion coefficient control fabric embedded in said resin matrix including a first group of generally parallel first and second yarns and a second group of generally parallel first and second yarns extending transverse to the yarns of said first group, said first yarns having a positive coefficient of thermal expansion, and said second yarns having a negative coefficient of thermal expansion.
Claim 2
Dependent Claim
70 words
A composite comprising: a resin matrix, a woven thermal expansion coefficient control fabric embedded in said resin matrix including a first group of generally parallel first and second yarns and a second group of generally parallel first and second yarns extending transverse to the yarns of said first group, said first yarns having a positive coefficient of thermal expansion, and said second yarns having a negative coefficient of thermal expansion.
Claim 3
Dependent Claim
20 words
The composite of claim 1 wherein: p1 said first yarns comprise glass fibers and said second yarns comprise aramid fibers.
Claim 4
Dependent Claim
78 words
A laminated composite comprising: a plurality of layers each comprising a resin matrix and a woven thermal expansion coefficient contral fabric embedded in said resin matrix including a first group of generally parallel first and second yarns and a second group of generally parallel first and second yarns extending transverse to the yarns of said first group, said first yarns having a positive coefficient of thermal expansion and said second yarns having a negative coefficient of thermal expansion.
Claim 5
Dependent Claim
78 words
A laminated composite comprising: a plurality of layers each comprising a resin matrix and a woven thermal expansion coefficient contral fabric embedded in said resin matrix including a first group of generally parallel first and second yarns and a second group of generally parallel first and second yarns extending transverse to the yarns of said first group, said first yarns having a positive coefficient of thermal expansion and said second yarns having a negative coefficient of thermal expansion.
Claim 6
Dependent Claim
19 words
The composite of claim 3 wherein: said first yarns comprise glass fibers and said second yarns comprise aramid fibers.
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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) | 1988-04-22 | 1988-10-22 | 1989-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-22 | 1992-10-22 | 1993-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-22 | 1996-10-22 | 1997-04-23 | $7700.00 | Window Closed / Lapsed |