US5063384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aircraft construction
Assignee: Boeing Co
•
Filing: 1989-10-13
•
Granted: 1991-11-05
•
Expires: 2009-10-13
Abstract
Abstract An aircraft structure for the minimization of microwave energy reflection from the aircraft back to a receiver. The provision of structural configurations and materials operate to reduce microwave energy reflection toward its source or another receiver located at a level below the aircraft and laterally or forward thereof.
Inventors
- 👤 Philip F. Novak
- 👤 Robert D. Shannon
- 👤 Robert L. Pinckney
- 👤 James R. Humphreys, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:30
CPC Classifications
B; B64; B64C; B64C1/00; B64C1/38; F; F41; F41H; F41H3/00; H; H01; H01Q; H01Q17/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
80 words
A structure for minimizing reflection of microwave energy back to its source comprising: a layer of structural plastic foam; microwave energy absorbing material filling said foam, and said filled foam having a dielectric constant of between two and ten and having a loss tangent of between 0.05 and unity and having a resistivity of between one hundred and ten thousand microohms per centimeter; and a skin of thin plastic material reinforced with non-metallic fiber covering said filled structural plastic foam.
Claim 2
Dependent Claim
80 words
A structure for minimizing reflection of microwave energy back to its source comprising: a layer of structural plastic foam; microwave energy absorbing material filling said foam, and said filled foam having a dielectric constant of between two and ten and having a loss tangent of between 0.05 and unity and having a resistivity of between one hundred and ten thousand microohms per centimeter; and a skin of thin plastic material reinforced with non-metallic fiber covering said filled structural plastic foam.
Claim 3
Dependent Claim
16 words
A structure as set forth in claim 1, wherein said microwave energy absorbing material is carbon.
Claim 4
Dependent Claim
22 words
A structure as set forth in claim 1, further comprising a filter in juxtaposition with said layer of filled structural plastic foam.
Claim 5
Dependent Claim
20 words
A structure as set forth in claim 3, wherein said filter comprises paint having a pigment including oxidized aluminum particles.
Claim 6
Dependent Claim
63 words
A structure as set forth in claim 3, further comprising a second layer of filled structural plastic foam, and said layers of filled structural plastic foam are graduated in dielectric constant and oriented in such a manner that the one of said layers having a lower dielectric constant is positioned closer to the source of microwave energy than the other of said layers.
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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) | 1994-11-04 | 1995-05-06 | 1995-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-04 | 1999-05-06 | 1999-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-04 | 2003-05-06 | 2003-11-05 | $7700.00 | Window Closed / Lapsed |