US4628365A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiation filter
Assignee: Individual
•
Filing: 1986-03-17
•
Granted: 1986-12-09
•
Expires: 2006-03-17
Abstract
Abstract A filter to absorb spurious radiation from a video display terminal comprises a sheet of radiation absorbent material having an open woven mesh overlieing one surface of the material. The filter is mounted in the terminal so that the mesh faces the operator. The mesh is effective to prevent reflection of incident light from the material.
Inventors
- 👤 Roger Carlton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:47
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/72
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
92 words
A radiation filter for the screen of a video display terminal comprising a transparent sheet of radiation absorbent material dimensioned to extend across and be disposed adjacent to said screen, an open mesh material juxtaposed on a surface of said sheet of radiation absorbent material directed away from said screen and means to secure said mesh to said sheet, said sheet of radiation absorbent material being interposed between said mesh and said screen to absorb radiation emitted therefrom, whereby light incident upon and transmitted through said sheet is absorbed by said mesh.
Claim 2
Dependent Claim
92 words
A radiation filter for the screen of a video display terminal comprising a transparent sheet of radiation absorbent material dimensioned to extend across and be disposed adjacent to said screen, an open mesh material juxtaposed on a surface of said sheet of radiation absorbent material directed away from said screen and means to secure said mesh to said sheet, said sheet of radiation absorbent material being interposed between said mesh and said screen to absorb radiation emitted therefrom, whereby light incident upon and transmitted through said sheet is absorbed by said mesh.
Claim 3
Dependent Claim
21 words
A radiation filter according to claim 1 wherein said radiation absorbent material is an acrylic copolymer resin having lead dispersed therein.
Claim 4
Dependent Claim
21 words
A radiation filter according to claim 2 wherein said lead is introduced into said resin as an organo lead salt compound.
Claim 5
Dependent Claim
30 words
A radiation filter according to claim 1 including a frame extending around the periphery of said radiation absorbent material with said mesh being interposed between said frame and said material.
Claim 6
Dependent Claim
22 words
A radiation filter according to claim 4 wherein said frame is cemeted to said material to secure said mesh to said material.
Claim 7
Dependent Claim
12 words
A radiation filter according to claim 1 wherein said mesh is woven.
Claim 8
Dependent Claim
19 words
A radiation filter according to claim 4 wherein the distance between adjacent fibres is between 60 and 136 microns.
Claim 9
Dependent Claim
16 words
A radiation filter according to claim 6 wherein said mesh is woven from a monofilament fibre.
Claim 10
Dependent Claim
12 words
A radiation filter according to claim 8 wherein said fibre is nylon.
References Cited (Backward Citations)
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Cited
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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) | 1989-12-08 | 1990-06-09 | 1990-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-08 | 1994-06-09 | 1994-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-08 | 1998-06-09 | 1998-12-09 | $7700.00 | Window Closed / Lapsed |