US3617285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light intensifying screens
Assignee: Eastman Kodak Co
•
Filing: 1969-10-21
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Granted: 1971-11-02
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Expires: 1989-10-21
Abstract
Abstract Improved inorganic phosphor screens comprising a support bearing a layer comprising a binder comprising a mixture of macromolecular bisphenol polycarbonates and copolymers comprising said bisphenol polycarbonates and poly(alkylene oxides) are described for radiographic use. Radiographic film-screen combinations are also disclosed.
Inventors
- 👤 William Joseph Staudenmayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:35
CPC Classifications
C; C08; C08L; C08L69/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
18 words
The intensifying screen of claim 1 in which said polycarbonate comprises recurring units containing an alkylidene bis(arylene) moiety.
Claim 2
Dependent Claim
17 words
The screen of claim 1 in which said blocks comprising units having Formula (II) are poly(tetramethylene oxides).
Claim 3
Dependent Claim
26 words
The screen of claim 1 in which said blocks comprising units having Formula (II) are aliphatic oxides having from about two to about 20 carbon atoms.
Claim 4
Dependent Claim
26 words
A screen of claim 1 in which the said phosphor is an inorganic metal phosphor, said metal selected from the lanthanide group of the periodic table.
Claim 5
Dependent Claim
50 words
The screen of claim 1 in which the phosphor is BaSO4:Pb, lead activated barium silicate, Y2O3:Gd, barium fluoride, lead activated strontium sulfate, BaFC1, PbSO4, BaSO4:Ln, europium activated barium strontium sulfate, or SrSO4:Ln where Ln is a lanthanide ion, said phosphor having more than half its emission in the ultraviolet region.
Claim 6
Dependent Claim
12 words
The screen of claim 1 in which said support is poly(ethylene terephthalate).
Claim 7
Dependent Claim
24 words
The screen of claim 1 in which the ratio of phosphor to binder is in the range of from about 30:1 to about 6:1.
Claim 8
Dependent Claim
31 words
The screen of claim 1 in which the phosphor is capable of exhibiting a scatter coefficient in the binder in the range of from about 200 to about 500 cm. 1.
Claim 9
Dependent Claim
17 words
The screen of claim 1 in which the phosphor is contained within an open pore structure binder.
Claim 10
Dependent Claim
23 words
The screen of claim 1 in which said polycarbonate and elastomer block copolymer comprising the binder for said phosphor is a discontinuous film
Claim 11
Dependent Claim
31 words
The screen of claim 1 in which said binder comprises a physical mixture of an elastomer in combination with a polycarbonate having recurring units of the structure having the following formula:
Claim 12
Dependent Claim
31 words
The binder of claim 12 in which the weight ratio of (III) to the elastomer copolymer comprising (II) of claim 1 is in the range from about 99:1 to about 50:50.
Claim 13
Dependent Claim
19 words
The screen of claim 12 in which the binder polycarbonate which is combined in physical mixture is poly(4,4''-isopropylidenediphenylene carbonate).
Claim 14
Dependent Claim
24 words
The screen of claim 12 in which the polycarbonate represented by formula (III) has an inherent viscosity of from about 0.4 to about 3.5.
Claim 15
Dependent Claim
23 words
The screen of claim 12 in which the polycarbonate (III) is comprised of from about 3 to about 50 of said recurring blocks.
Claim 16
Dependent Claim
13 words
The screen of claim 1 in combination with a radiographic image forming element.
Claim 17
Dependent Claim
13 words
The screen combination of claim 17 in which said element contains silver halide.
References Cited (Backward Citations)
US2409162A
Cited
US3028365A
Cited
US2819183A
Cited
US3010043A
Cited
US3282697A
Cited
US3287442A
Cited
US3512984A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |