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US4896164A
Expired / Lapsed
US
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Radar transparent window for commercial buildings
Assignee: Grumman Corp
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Filing: 1988-08-30
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Granted: 1990-01-23
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Expires: 2008-08-30
Abstract
Abstract A radar-transparent window may be architecturally and structurally mounted within the walls of a building to optically conceal the space behind the window while freely allowing signal transmission between an interior radar antenna and remotely situated radar target. The window in its basic form includes inner and outer layers typically fabricated from a polyester resin/E-Glass laminate while a core layer is present which may be comprised of a rigid polyimide foam.
Inventors
- 👤 Charles Burke
- 👤 Joao F. I. Falcao
- 👤 Albert R. Sarraffe
- 👤 Michael T. Curtin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:40
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/42
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
79 words
A building structure comprising: a plurality of structural walls; an opening formed in at least one of the walls; multi-layered panel means mounted in the opening for permitting transparent radar transmission therethrough while optically obscuring the interior space behind the panel, the panel means comprising: an inner layer of polyester resin/E-glass laminate; an outer layer of polymide resin/E-glass laminate having a light reflective exterior surface resembling window pane glass; and at least one core layer of rigid polyimide foam.
Claim 2
Dependent Claim
79 words
A building structure comprising: a plurality of structural walls; an opening formed in at least one of the walls; multi-layered panel means mounted in the opening for permitting transparent radar transmission therethrough while optically obscuring the interior space behind the panel, the panel means comprising: an inner layer of polyester resin/E-glass laminate; an outer layer of polymide resin/E-glass laminate having a light reflective exterior surface resembling window pane glass; and at least one core layer of rigid polyimide foam.
Claim 3
Dependent Claim
14 words
The structure set forth in claim 1 wherein the outer layer surface is painted.
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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) | 1993-01-22 | 1993-07-24 | 1994-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-22 | 1997-07-24 | 1998-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-22 | 2001-07-24 | 2002-01-23 | $7700.00 | Window Closed / Lapsed |