US3923515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-Ray film with reduced print-through
Assignee: EIDP Inc
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Filing: 1974-06-24
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Granted: 1975-12-02
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Expires: 1994-06-24
Abstract
Abstract Silver halide X-ray film with reduced print-through and improved sensitometric characteristics is provided by a film support having on both sides a low speed, fine grain emulsion overcoated with a high speed, preferably large grain emulsion, the ratio of the speed of the fast to the slow emulsion being from two to ten.
Inventors
- 👤 Stappen Albert L Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:30
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/16; G03C1/00; G03C1/005; G03C1/46; G03C2200/00; G03C2200/58; Y; Y10; Y10S; Y10S430/00; Y10S430/149; Y10S430/15; Y10S430/162; Y10S430/167; Y10S430/168
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
69 words
AN IMPROVED X-RAY FILM COMPRISING A SUPPORT BEARING ON BOTH SIDES A LAYER OF A LOW SPEED, FINE GRAIN SILVER HALIDE EMULSION OVERCOATED WITH A LAYER OF A HIGH SPEED SILVER HALIDE EMULSION, THE HIGH SPEED EMULSION HAVING A PHOTOGRAPHIC SPEED FROM 2 TO 10 TIMES THAT OF SAID LOW SPEED EMULSION, AND SAID LOW SPEED EMULSION HAVING A SILVER HALIDE GRAIN SIZE OF FROM 0.1 TO 1.4 MICRON.
Claim 2
Dependent Claim
69 words
AN IMPROVED X-RAY FILM COMPRISING A SUPPORT BEARING ON BOTH SIDES A LAYER OF A LOW SPEED, FINE GRAIN SILVER HALIDE EMULSION OVERCOATED WITH A LAYER OF A HIGH SPEED SILVER HALIDE EMULSION, THE HIGH SPEED EMULSION HAVING A PHOTOGRAPHIC SPEED FROM 2 TO 10 TIMES THAT OF SAID LOW SPEED EMULSION, AND SAID LOW SPEED EMULSION HAVING A SILVER HALIDE GRAIN SIZE OF FROM 0.1 TO 1.4 MICRON.
Claim 3
Dependent Claim
14 words
An X-ray film according to claim 1, said silver halide emulsions being gelatino emulsions.
Claim 4
Dependent Claim
28 words
An X-ray film according to claim 1, said high speed silver halide emulsion being a silver iodobromide emulsion and said low speed emulsion being a silver chlorobromide emulsion.
Claim 5
Dependent Claim
19 words
An X-ray film of claim 3, said low speed silver chlorobromide emulsion containing at least 50 mole percent chloride.
Claim 6
Dependent Claim
23 words
An X-ray film according to claim 1, said high speed emulsion having a silver halide grain size of from 1 to 2 microns.
Claim 7
Dependent Claim
22 words
An X-ray film according to claim 1, said low speed emulsion having a silver halide grain size of 0.4 to 0.8 micron.
Claim 8
Dependent Claim
14 words
An X-ray film according to claim 1, said support being a transparent polymeric film.
Claim 9
Dependent Claim
14 words
An X-ray film according to claim 7, said support having gelatin subbing layers thereon.
Claim 10
Dependent Claim
18 words
An X-ray film according to claim 1, the high speed emulsion layers being overcoated with nonphotosensitive anti-abrasion layers.
Claim 11
Dependent Claim
33 words
A process of making improved radiographic images comprising exposing the X-ray film of claim 1 to X-radiation, there being X-ray intensifying screens on both sides of and in operative association with said film.
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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |