US4030098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and means for reducing reflections of electromagnetic waves
Assignee: United States Department of the Army
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Filing: 1962-03-26
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Granted: 1977-06-14
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Expires: 1982-03-26
Abstract
Abstract 1. A method for reducing the reflections of electromagnetic wave energy f material surfaces comprising applying to said material surface a radioactive substance for producing a cloud of electrons in the space enclosing said surface in sufficient quantity and so distributed as to produce a relatively uniform surface activity of an average value in the order of 10 curies per square centimeter.
Inventors
- 👤 Maurice E. Nahmias
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:09
CPC Classifications
H; H01; H01Q; H01Q17/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
61 words
A method for reducing the reflections of electromagnetic wave energy from material surfaces comprising applying to said material surface a radioactive substance for producing a cloud of electrons in the space enclosing said surface in sufficient quantity and so distributed as to produce a relatively uniform surface activity of an average value in the order of 10 cures per square centimeter.
Claim 2
Independent Claim
61 words
A method for reducing the reflections of electromagnetic wave energy from material surfaces comprising applying to said material surface a radioactive substance for producing a cloud of electrons in the space enclosing said surface in sufficient quantity and so distributed as to produce a relatively uniform surface activity of an average value in the order of 10 cures per square centimeter.
Claim 3
Independent Claim
42 words
A method for reducing the reflection of electromagnetic wave energy from a material surface comprising applying to said material surface a coating containing Strontium 90 in sufficient concentration to produce a surface activity of between 1 and 25 curies per square centimeter.
Claim 4
Independent Claim
42 words
A method for reducing the reflection of electromagnetic wave energy from a material surface comprising applying to said material surface a coating containing Strontium 90 in sufficient concentration to produce a surface activity of between 1 and 25 curies per square centimeter.
Claim 5
Independent Claim
44 words
A method for reducing the reflections of electromagnetic wave energy from a material surface comprising applying to said material surface a coating of material containing polonium 210 in sufficient concentration to produce a surface activity in the order of 10 curies per square centimeter.
Claim 6
Independent Claim
44 words
A method for reducing the reflections of electromagnetic wave energy from a material surface comprising applying to said material surface a coating of material containing polonium 210 in sufficient concentration to produce a surface activity in the order of 10 curies per square centimeter.
Claim 7
Independent Claim
57 words
A method for reducing reflections of electromagnetic wave energy from flying objects, ballistic rockets and the like comprising applying to singular reflecting surfaces of said objects, a radioactive substance for creating in the space surrounding said objects a cloud of electrons having an average electron density of between 10 7 and 10 10 electrons per cubic centimeter.
Claim 8
Independent Claim
57 words
A method for reducing reflections of electromagnetic wave energy from flying objects, ballistic rockets and the like comprising applying to singular reflecting surfaces of said objects, a radioactive substance for creating in the space surrounding said objects a cloud of electrons having an average electron density of between 10 7 and 10 10 electrons per cubic centimeter.
Claim 9
Dependent Claim
79 words
In combination with a normally reflecting surface in a gaseous medium, a layer of substance for minimizing reflection of radio frequency waves, said layer comprising a coating of material containing a radioactive substance for ionizing the gaseous medium and creating a cloud of electrons to shroud the surface, varying in electron density inversely with distance from said surface the concentration of said substance being sufficient to produce a surface activity in the order of 10 curies per square centimeter.
Claim 10
Dependent Claim
79 words
In combination with a normally reflecting surface in a gaseous medium, a layer of substance for minimizing reflection of radio frequency waves, said layer comprising a coating of material containing a radioactive substance for ionizing the gaseous medium and creating a cloud of electrons to shroud the surface, varying in electron density inversely with distance from said surface the concentration of said substance being sufficient to produce a surface activity in the order of 10 curies per square centimeter.
Claim 11
Dependent Claim
82 words
In combination with an aircraft having normally reflecting surfaces to radio frequency electromagnetic waves, a coating at singular places on its reflecting surfaces, said coating comprising a substance containing a radioactive material for creating a cloud of electrons in space to shroud said aircraft and provie attenuation to said rdio frequency electromagnetic waves incident thereon the distribution and concentration of said radioactive material producing a relatively uniform surface activity whose average value is in the order of 10 curies per square centimeter.
Claim 12
Dependent Claim
82 words
In combination with an aircraft having normally reflecting surfaces to radio frequency electromagnetic waves, a coating at singular places on its reflecting surfaces, said coating comprising a substance containing a radioactive material for creating a cloud of electrons in space to shroud said aircraft and provie attenuation to said rdio frequency electromagnetic waves incident thereon the distribution and concentration of said radioactive material producing a relatively uniform surface activity whose average value is in the order of 10 curies per square centimeter.
Claim 13
Dependent Claim
14 words
The combination as defined in claim 6 wherein said radioactive substance is strontium 90.
Claim 14
Dependent Claim
14 words
The combination as defined in claim 6 wherei the radioactive material is polonium 210.
References Cited (Backward Citations)
US3713157A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |