US5103231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic wave absorber
Assignee: Individual
•
Filing: 1990-09-25
•
Granted: 1992-04-07
•
Expires: 2010-09-25
Abstract
Abstract Disclosed is a wave absorber, comprising a wave absorbing panel prepared by forming a mixture containing a ferrite powder, a metal fiber, a molding material and a resin into a framework, by means of molding and/or press-cutting, having an arbitrary shape of hollow spaces which are adapted to the frequency and wavelength of an electromagnetic wave, and an electrically conductive filter plate, made of a mixture of a ferrite powder, a metal fiber and a resin, laminated thereon. The wave absorber may have a weathering-resistant electromagnetic wave transmitting plate on the surface thereof and the electromagnetic wave transmitting plate may comprise a reinforced ceramic panel made by laminating a ceramic plate with a Kevlar cloth, glass cloth or other web.
Inventors
- 👤 Yoshio Niioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:25
CPC Classifications
H; H01; H01Q; H01Q17/00; H01Q17/004; H01Q17/008
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
63 words
A wave absorber comprising: a wave absorbing panel made from a mixture containing a ferrite powder, a metal fiber, a molding material and a resin; an arbitrary shape of hollow spaces formed in said wave absorbing panel which are adapted to the frequency and wave length of an electromagnetic wave to be absorbed; and an electrically conductive filter plate laminated on said panel.
Claim 2
Dependent Claim
63 words
A wave absorber comprising: a wave absorbing panel made from a mixture containing a ferrite powder, a metal fiber, a molding material and a resin; an arbitrary shape of hollow spaces formed in said wave absorbing panel which are adapted to the frequency and wave length of an electromagnetic wave to be absorbed; and an electrically conductive filter plate laminated on said panel.
Claim 3
Dependent Claim
14 words
The wave absorber according to claim 1, wherein the panel has a lattice structure.
Claim 4
Dependent Claim
14 words
The wave absorber according to claim 1, wherein the panel has a honeycomb structure.
Claim 5
Dependent Claim
20 words
The wave absorber according to claim 1, wherein the panel has an arbitrary shape of circular hollow spaces including ellipsoid.
Claim 6
Dependent Claim
19 words
The wave absorber according to claim 1 to 4, wherein the wave absorbing panel is molded in a mold.
Claim 7
Dependent Claim
28 words
The wave absorber according to claim 1 to 4, wherein the electrically conductive filter plate comprises a mixture of a ferrite powder, a metal fiber and a resin.
Claim 8
Dependent Claim
80 words
The wave absorber comprising: a wave absorbing panel made from a mixture containing a ferrite powder, a metal fiber, a molding material and a resin; a arbitrary shape of hollow spaces formed in said wave absorbing panel which are adapted to the frequency and wave length of an electromagnetic wave to be absorbed; an electrically conductive filter plate laminated on said panel; and an electromagnetic wave transmitting plate having weathering resistance applied on the surface of the wave absorbing panel.
Claim 9
Dependent Claim
80 words
The wave absorber comprising: a wave absorbing panel made from a mixture containing a ferrite powder, a metal fiber, a molding material and a resin; a arbitrary shape of hollow spaces formed in said wave absorbing panel which are adapted to the frequency and wave length of an electromagnetic wave to be absorbed; an electrically conductive filter plate laminated on said panel; and an electromagnetic wave transmitting plate having weathering resistance applied on the surface of the wave absorbing panel.
Claim 10
Dependent Claim
33 words
The wave absorber according to claim 7, wherein the electromagnetic wave transmitting plate is a reinforced ceramic panel comprising a ceramic plate with a Kevlar cloth, glass cloth or other web bonded thereto.
References Cited (Backward Citations)
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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) | 1995-04-07 | 1995-10-07 | 1996-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-07 | 1999-10-07 | 2000-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-07 | 2003-10-07 | 2004-04-07 | $7700.00 | Window Closed / Lapsed |