US3743833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiographic elements and binders
Assignee: Eastman Kodak Co
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Filing: 1971-07-16
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Granted: 1973-07-03
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Expires: 1991-07-16
Abstract
Abstract Luminescent radiographic screen binders comprising a combination of a polyurethane elastomer alone or in combination with an alkyl methacrylate polymer in various weight ratios are disclosed. Said screens combined with radiographic sensitive elements exhibit improved optical and physical characteristics.
Inventors
- 👤 P Martic
- 👤 J Mccabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:42
CPC Classifications
G; G21; G21K; G21K4/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
63 words
A phosphorescent radiographic screen comprising a support bearing a layer comprising a phosphor dispersed in an elastomeric polyurethane binder having a specific gravity above about 1.00, a hardness (measured on the Shore-A-Scale) of from about 70 to 95, a tensile strength of between about 3,000 and 12,000 LB/sq. in., and a modulus at 300 percent elongation of from about 4,000 to about 5,000.
Claim 2
Dependent Claim
23 words
The screen of claim 2 in which said support has a high absorptivity to emitted light in the spectral region of said phosphor.
Claim 3
Dependent Claim
22 words
The screen of claim 3 comprising 5-benzylidene-3-carbamoyl-4-phenyl-2-(5H)-furanone in said support as imparting a high absorptivity to light in the ultraviolet spectral region.
Claim 4
Dependent Claim
14 words
The screen of claim 3 in which said high absorptivity is to ultraviolet light.
Claim 5
Dependent Claim
13 words
The screen of claim 2 in which said support comprises a polyester film.
Claim 6
Dependent Claim
12 words
The screen of claim 6 in which said polyester is poly(ethylene terephthalate).
Claim 7
Dependent Claim
17 words
The screen of claim 2 in which said support bears a non-color imparting layer comprising said phosphor.
Claim 8
Dependent Claim
15 words
The screen of claim 2 in which said phosphor comprises at least one rare-earth activator.
Claim 9
Dependent Claim
19 words
The screen of claim 2 in which said phosphor comprises barium lead sulfate or europium activated barium strontium sulfate.
Claim 10
Dependent Claim
15 words
The screen of claim 2 further comprising a protective overcoat consisting essentially of cellulose acetate.
Claim 11
Dependent Claim
15 words
The screen of claim 2 further comprising a backing layer consisting essentially of cellulose acetate.
Claim 12
Dependent Claim
30 words
A screen according to claim 2 comprising a phosphor present in relation to said binder in a ratio range of from about 10 to 1 to about 25 to 1.
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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |