US4173018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-radar means and techniques
Assignee: Whittaker Corp
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Filing: 1967-07-27
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Granted: 1979-10-30
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Expires: 1987-07-27
Abstract
Abstract Magnetizable particles ranging in size from 0.5 to 20 microns are dispersed in an insulating binder of thermosetting material to form a mixture in which such particles comprise approximately 90% of the weight of such mixture. The particles are either spherical or the mixture may be magnetizable material coated on spherical glass balls of micron size. The mixture is applied by painting or spraying to form a coating of approximately 40 mils or an otherwise metallic reflecting body or may be so applied to a sheet of flexible material which in turn is affixed to a metallic material otherwise exhibiting reflectivity for energy in the frequency range of 2 to 10 Ghz.
Inventors
- 👤 Maynard H. Dawson
- 👤 Leonard P. Suffredini
- 👤 John R. O'Neal
- 👤 William E. Converse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:35
CPC Classifications
H; H01; H01Q; H01Q17/00; H01Q17/004
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
42 words
A mixture used for the attenuation of electromagnetic wave energy in the frequency range of 2 to 10 GHz consisting of magnetizable particles dispersed in an insulating binder, the size of said particles being within the range of 0.5 to 20 microns.
Claim 2
Dependent Claim
42 words
A mixture used for the attenuation of electromagnetic wave energy in the frequency range of 2 to 10 GHz consisting of magnetizable particles dispersed in an insulating binder, the size of said particles being within the range of 0.5 to 20 microns.
Claim 3
Dependent Claim
21 words
A mixture as set forth in claim 1 wherein said magnetizable particles comprise at least one-half the weight of the mixture.
Claim 4
Dependent Claim
21 words
A mixture as set forth in claim 1 wherein said magnetizable material comprises approximately 80% of the weight of the mixture.
Claim 5
Dependent Claim
15 words
A mixture as set forth in claim 1 wherein said binder is a thermosetting material.
Claim 6
Dependent Claim
17 words
A mixture as set forth in claim 1 in which said binder is essentially an organic material.
Claim 7
Dependent Claim
15 words
A mixture as set forth in claim 1 in which said particles are essentially spherical.
Claim 8
Dependent Claim
35 words
A mixture used for the attenuation of electromagnetic wave energy in the frequency range of 2 to 10 GHz consisting of magnetizable particles dispersed in an insulating binder, said binder being essentially a metallic compound.
Claim 9
Dependent Claim
35 words
A mixture used for the attenuation of electromagnetic wave energy in the frequency range of 2 to 10 GHz consisting of magnetizable particles dispersed in an insulating binder, said binder being essentially a metallic compound.
Claim 10
Dependent Claim
38 words
A mixture used for the attenuation of electromagnetic wave energy in the frequency range of 2 to 10 GHz consisting of magnetizable particles dispersed in an insulating binder, said particles being glass balls coated with a magnetizable material.
Claim 11
Dependent Claim
38 words
A mixture used for the attenuation of electromagnetic wave energy in the frequency range of 2 to 10 GHz consisting of magnetizable particles dispersed in an insulating binder, said particles being glass balls coated with a magnetizable material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-29 | 1983-04-30 | 1983-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-29 | 1987-04-30 | 1987-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-29 | 1991-04-30 | 1991-10-30 | $7700.00 | Window Closed / Lapsed |