US3665186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Half tone radiography method and apparatus
Assignee: Fujifilm Holdings Corp
•
Filing: 1969-12-04
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Granted: 1972-05-23
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Expires: 1989-12-04
Abstract
Abstract A radiographic method by inserting between an object to be recorded and an X-ray film a sine-wave-like net-screen. The net pattern may be formed by filling a metallic powder having a property of absorbing the X-rays into the concave net pattern of the sine-wave-like screen. The presence of the screen prevents the occurrence of troubles caused by scattered X-rays and permits the tone of the image to be varied by selecting the material filled into the concave net pattern.
Inventors
- 👤 Mataichi Tajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:54
CPC Classifications
G; G21; G21K; G21K1/00; G21K1/02; G21K1/025; G21K4/00
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
48 words
The method of claim 1 wherein said half tone screen is molded from a material selected from the group consisting of a metal, a metal powder, a composition of a metal powder and a binder, powdered metal salts, and an admixture of powdered metal salts and a binder.
Claim 2
Dependent Claim
22 words
The method of claim 1 further comprising interposing a fluorescent intensifying screen between said half tone screen and said X-ray sensitive material.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein said screen has a spacing of from about 80 to about 200 microns.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein said screen Has a spacing of about 200.
Claim 5
Dependent Claim
24 words
The method of claim 1 wherein a powdered metal or powdered metal compound is filled in the concave portions of said half tone screen.
Claim 6
Dependent Claim
10 words
The method of claim 6 wherein the spacing is 200.
Claim 7
Dependent Claim
11 words
The method of claim 6 wherein the spacing is 400 microns.
Claim 8
Dependent Claim
15 words
The method of claim 1 wherein said screen has a spacing of about 400 microns.
Claim 9
Dependent Claim
21 words
The method of claim 1 wherein a powdered metal compound is filled in the concave portions of said half tone screen.
Claim 10
Dependent Claim
17 words
The method of claim 1 wherein said half tone screen is in the form of a sine-wave.
Claim 11
Dependent Claim
57 words
A radiation absorbing half tone screen comprising a support member of sine-wave-like form having repeating, alternate concave and convex portions which provide a constantly changing repetitive variation in the X-ray permeability of the screen, said screen having a spacing between peaks of neighboring concave portions in the range of from about 80 microns to about 400 microns.
Claim 12
Dependent Claim
18 words
The radiation absorbing half tone screen of claim 12 wherein said concave portions are filled with powdered metal.
Claim 13
Dependent Claim
20 words
The radiation absorbing half tone screen of claim 12 wherein said concave portions are filled with a powdered metal compound.
Claim 14
Dependent Claim
52 words
The radiation absorbing half tone screen of claim 12 wherein said half tone screen is molded from a material selected from the group consisting of a metal, a metal powder, a composition of a metal powder and a binder, powdered metal salts, and an admixture of powdered metal salts and a binder.
Claim 15
Dependent Claim
51 words
The radiation absorbing half tone screen of claim 15 wherein said half tone screen is molded from a material selected from the group consisting of a metal, a metal powder and a composition of a metal powder and a binder, wherein said metal powder is less than 50 microns in diameter.
Claim 16
Dependent Claim
24 words
The radiation absorbing half tone screen of claim 16 wherein said metal powder is selected from the group consisting of iron, lead and tin.
Claim 17
Dependent Claim
38 words
The radiation absorbing half tone screen of claim 15 wherein said half tone screen is molded from a material selected from the group consisting of powdered metal salts and an admixture of powdered metal salts and a binder.
Claim 18
Dependent Claim
33 words
The radiation absorbing half tone screen of claim 18 wherein said metal salt is selected from the group consisting of mercuric sulfide, mercuric oxide, stannic sulfide, trilead teroxide, barium sulfate, and bismuth oxides.
Claim 19
Dependent Claim
14 words
The radiation absorbing half tone screen of claim 15 wherein said binder is resinous.
Claim 20
Dependent Claim
14 words
The radiation absorbing half tone screen of claim 18 wherein said binder is resinous.
Claim 21
Dependent Claim
25 words
The radiation absorbing half tone screen of claim 12 wherein said spacing is in the range of from about 80 microns to about 200 microns.
Claim 22
Dependent Claim
19 words
The radiation absorbing half tone screen of claim 12 wherein said support is in the form of a sine-wave.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |