US3836784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Activated iodide x-ray image intensifier screen
Assignee: Individual
•
Filing: 1973-03-06
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Granted: 1974-09-17
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Expires: 1993-03-06
Abstract
Abstract X-ray image intensifier screens are provided having a thin film of activated iodide phosphor in a polyfluorinated, polymeric binder. The greatly enhanced response of the activated iodide phosphor greatly reduces X-ray dosages to patients as compared to present X-ray dosages employing calcium tungstate as the luminescent material.
Inventors
- 👤 C Bates
- 👤 R Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:39
CPC Classifications
G; G21; G21K; G21K4/00; C; C09; C09K; C09K11/00; C09K11/02; C09K11/08; C09K11/61; C09K11/615; C09K11/616
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
11 words
A screen according to claim 1, wherein said polymer is polytrichlorofluoroethylene.
Claim 2
Dependent Claim
17 words
A screen according to claim 1, wherein said polymer is a copolymer of vinylidene fluoride and chlorotrifluoroethylene.
Claim 3
Dependent Claim
33 words
A screen according to claim 1, wherein said film is of from about 2 to 10 mils in thickness, and said crystals are on the average of from about 1 to 20 microns.
Claim 4
Dependent Claim
30 words
A screen according to claim 1, wherein said film is of from about 4 to 7 mils in thickness, and said crystals are of about 5 microns on the average.
Claim 5
Dependent Claim
62 words
A film for use in an X-ray image intensifier screen of from about 2 to 10 mils thickness comprising at least 60 weight percent of sodium activated cesium iodide crystals of a size on the average in the range of about 1 to 20 microns and a polyvinylidene fluoride polymer as the binder having at least 60 number percent of chlorotrifluoroethylene monomer.
Claim 6
Dependent Claim
25 words
A film according to claim 6, wherein said crystals are on the average of a size in the range of about 2 to 10 microns.
Claim 7
Dependent Claim
78 words
An X-ray image intensifier screen comprising a film of from about 4 to 7 mils average thickness of polyvinylidene fluoride polymer having at least 60 number percent of a perhalogenated monomer of halogen of atomic number 9 to 17 and having from about 60 to 80 weight percent of sodium activated cesium iodide crystals of a size in the range of about 1 to 20 microns, substantially uniformly distributed therein, said film being bonded to a stable substrate.
Claim 8
Dependent Claim
19 words
A screen according to claim 8, having a coating intermediate said film and substrate of an opaque reflective material.
Claim 9
Dependent Claim
20 words
A screen according to claim 9, wherein said coating is aluminum film of about 0.5 to 2 mils in thickness.
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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |