US5396249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave absorber and process for manufacturing same
Assignee: Otsuka Science Co Ltd
•
Filing: 1993-09-03
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Granted: 1995-03-07
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Expires: 2013-09-03
Abstract
Abstract A microwave absorber in a pointed shape, including a phenol resin foam containing a dielectric loss material, is prepared by setting an incombustible sheet container of a same shape in a mold in a pointed shape, pouring the phenol resin to which the dielectric loss material is blended, and foaming and curing. As a result, a semi-incombustible or incombustible microwave absorber of high strength possessing a high microwave absorption capacity in a wideband is obtained.
Inventors
- 👤 Shinichi Yamada
- 👤 Kyoji Miyata
- 👤 Kazuhiko Mori
- 👤 Osamu Yamamoto
- 👤 Yukitoshi Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:47
CPC Classifications
H; H01; H01Q; H01Q17/00; H01Q17/008
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
40 words
A microwave absorber comprising a phenol resin foam into which a dielectric loss material has been blended prior to foaming, a density of the phenol resin foam being in a range from 30 kg/m 3 to 300 kg/m 3 .
Claim 2
Dependent Claim
40 words
A microwave absorber comprising a phenol resin foam into which a dielectric loss material has been blended prior to foaming, a density of the phenol resin foam being in a range from 30 kg/m 3 to 300 kg/m 3 .
Claim 3
Dependent Claim
15 words
The microwave absorber of claim 1, wherein a shape of the microwave absorber is pyramidal.
Claim 4
Dependent Claim
26 words
The microwave absorber of claim 1, wherein a surface of the phenol resin foam is covered with an incombustible sheet, the incombustible sheet including inorganic fiber.
Claim 5
Dependent Claim
32 words
The microwave absorber of claim 1, wherein the dielectric loss material is contained at a rate of 0.4 to 10 parts by weight to 100 parts by weight of the phenol resin.
Claim 6
Dependent Claim
76 words
A process for manufacturing a microwave absorber having a pointed shape, said process comprising: setting, in a mold having a pointed shape, a container which has a shape that is the same as the shape of the mold and which is formed of an incombustible sheet, the incombustible sheet including an inorganic fiber; pouring into the mold phenol resin into which a dielectric loss material is blended; foaming the phenol resin; and curing the phenol resin.
Claim 7
Dependent Claim
76 words
A process for manufacturing a microwave absorber having a pointed shape, said process comprising: setting, in a mold having a pointed shape, a container which has a shape that is the same as the shape of the mold and which is formed of an incombustible sheet, the incombustible sheet including an inorganic fiber; pouring into the mold phenol resin into which a dielectric loss material is blended; foaming the phenol resin; and curing the phenol resin.
Claim 8
Dependent Claim
20 words
The process for manufacturing a microwave absorber of claim 5, wherein a foaming agent is blended into the phenol resin.
Claim 9
Dependent Claim
20 words
The process for manufacturing a microwave absorber of claim 5, wherein a hardening agent is blended into the phenol resin.
Claim 10
Dependent Claim
21 words
The process for manufacturing a microwave absorber of claim 5, wherein a foam shaping agent is blended into the phenol resin.
Claim 11
Dependent Claim
20 words
The process for manufacturing a microwave absorber of claim 5, wherein a flame retardant is blended into the phenol resin.
Claim 12
Dependent Claim
20 words
A microwave absorber comprising a phenol resin foam into which a dielectric loss material has been blended prior to foaming.
Claim 13
Dependent Claim
20 words
A microwave absorber comprising a phenol resin foam into which a dielectric loss material has been blended prior to foaming.
Claim 14
Dependent Claim
15 words
The microwave absorber of claim 10, wherein a shape of the microwave absorber is pyramidal.
Claim 15
Dependent Claim
26 words
The microwave absorber of claim 10, wherein a surface of the phenol resin foam is covered with an incombustible sheet, the incombustible sheet including inorganic fiber.
Claim 16
Dependent Claim
31 words
The microwave absorber of claim 10, wherein the dielectric loss material is contained at a rate of 0.4 to 10 parts by weight to 100 parts by weight of phenol resin.
References Cited (Backward Citations)
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Cited
US2977591A
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US3836967A
Cited
US3721982A
Cited
US4003840A
Cited
US4538151A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-06 | 1998-09-05 | 1999-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-06 | 2002-09-05 | 2003-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-06 | 2006-09-05 | 2007-03-07 | $7700.00 | Window Closed / Lapsed |