Patent US4484195A successfully refreshed from Google Patents.
US4484195A
Expired / Lapsed
US
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Method of screening infra-red radiation
Assignee: United States Department of the Army
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Filing: 1960-06-10
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Granted: 1984-11-20
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Expires: 1980-06-10
Abstract
Abstract A method of screening infra-red radiation is disclosed which comprises forming between the source of said radiation and the point of reception or detection an aerosol of finely-divided, thin flat particles of aluminum which is highly reflective and opaque to said radiation, the dimensions of said particles being of the same order of magnitude as the wavelength of said radiation.
Inventors
- 👤 Roy E. Shaffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:00
CPC Classifications
F; F41; F41H; F41H9/00; F41H9/06; B; B01; B01D; B01D1/00; B01D1/14; C; C09; C09K; C09K3/00; C09K3/30; H; H01; H01Q; H01Q15/00; H01Q15/14; H01Q15/145; Y; Y10; Y10S; Y10S516/00; Y10S516/922
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
58 words
A method of screening infra-red radiation which comprises forming between the source of said radiation and the point of reception, an aerosol of finely divided, thin, flat, particles of aluminum which is highly reflective and opaque to said radiation, the dimensions of said particles being of the same order of magnitude as the wave lengths of said radiation.
Claim 2
Independent Claim
58 words
A method of screening infra-red radiation which comprises forming between the source of said radiation and the point of reception, an aerosol of finely divided, thin, flat, particles of aluminum which is highly reflective and opaque to said radiation, the dimensions of said particles being of the same order of magnitude as the wave lengths of said radiation.
Claim 3
Independent Claim
64 words
A method of screening infra-red radiation having wave lengths in excess of 1 micron which comprises forming between the source of said radiation and the point of reception, an aerosol of flake-like aluminum particles, said particles having diameters in the range of 2 to 20 microns and thicknesses less than 3/10 micron but sufficiently great to render said flakes opaque to said infra-red radiation.
Claim 4
Independent Claim
64 words
A method of screening infra-red radiation having wave lengths in excess of 1 micron which comprises forming between the source of said radiation and the point of reception, an aerosol of flake-like aluminum particles, said particles having diameters in the range of 2 to 20 microns and thicknesses less than 3/10 micron but sufficiently great to render said flakes opaque to said infra-red radiation.
Claim 5
Independent Claim
69 words
A method of screening a detector from a source of infra-red radiation, said radiation having wave lengths in excess of 1 micron, which comprises forming between said detector and said source an aerosol of flake-like aluminum particles, said particles having diameters in the range of 2 to 20 microns and thicknesses of less than 3/10 microns, said thicknesses being sufficiently great to render said flakes opaque to said radiation.
Claim 6
Independent Claim
69 words
A method of screening a detector from a source of infra-red radiation, said radiation having wave lengths in excess of 1 micron, which comprises forming between said detector and said source an aerosol of flake-like aluminum particles, said particles having diameters in the range of 2 to 20 microns and thicknesses of less than 3/10 microns, said thicknesses being sufficiently great to render said flakes opaque to said radiation.
Claim 7
Independent Claim
67 words
A method of preventing the detection of an object emitting infra-red radiation, having wave lengths in excess of 1 micron, which comprises forming adjacent said object a cloud comprising an aerosol of flake-like aluminum particles, said particles having diameters in the range of 2 to 20 microns and thicknesses of less than 3/10 microns, said thicknesses being sufficiently great to render said particles opaque to said radiation.
Claim 8
Independent Claim
67 words
A method of preventing the detection of an object emitting infra-red radiation, having wave lengths in excess of 1 micron, which comprises forming adjacent said object a cloud comprising an aerosol of flake-like aluminum particles, said particles having diameters in the range of 2 to 20 microns and thicknesses of less than 3/10 microns, said thicknesses being sufficiently great to render said particles opaque to said radiation.
References Cited (Backward Citations)
US1456112A
Cited
US2540108A
Cited
US2512435A
Cited
US2643982A
Cited
US2970927A
Cited
US2740761A
Cited
US2927849A
Cited
US2909491A
Cited
US2871344A
Cited
US2986527A
Cited
US2944029A
Cited
US3754256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-20 | 1988-05-21 | 1988-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-20 | 1992-05-21 | 1992-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-20 | 1996-05-21 | 1996-11-20 | $7700.00 | Window Closed / Lapsed |