Patent US3912933A successfully refreshed from Google Patents.
US3912933A
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US
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Fine detail radiographic elements and exposure method
Assignee: EIDP Inc
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Filing: 1973-10-17
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Granted: 1975-10-14
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Expires: 1993-10-17
Abstract
Abstract A novel film/screen combination particularly useful for the radiographic examination of the breast (e.g. mammography), bodysection radiography (e.g. tomography), industrial radiography, and for radiographic examination of the extremities is disclosed comprising a film support carrying a single layer of a fine grain silver halide emulsion in contact with an X-ray intensifying screen and having an antihalation backing coated on the opposite side of the film support. The emulsion having particular speed and grain characteristics combined with a fluorescent X-ray intensifying screen of a particular speed, yields an excellent image free of quantum mottle, or screen noise at low exposure.
Inventors
- 👤 Stappen Albert L Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:06
CPC Classifications
G; G03; G03B; G03B42/00; G03B42/02; G03B42/04; G03C; G03C5/00; G03C5/16; G03C5/17; Y; Y10; Y10S; Y10S430/00; Y10S430/167; Y10S430/168
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
58 words
A RADIOGRAPHIC ELEMENT COMPRISING A FILM SUPPORT BEARING A SINGLE SILVER HALIDE EMULSION LAYER AND AN ANTIHALATION LAYER, SAID SILVER HALIDE EMULSION HAVING AN AVERAGE SILVER HALIDE GRAIN SIZE OF 0.4 TO 1.2 MICRONS, AD AN X-RAY INTENSIFYING SCREEN IN CONTACT WITH SAID EMULSION LAYER, SAID EMULSION LAYER AND SCREEN HAVNG A SPEED FACTOR BETWEEN 2.5 AND 4.5.
Claim 2
Dependent Claim
58 words
A RADIOGRAPHIC ELEMENT COMPRISING A FILM SUPPORT BEARING A SINGLE SILVER HALIDE EMULSION LAYER AND AN ANTIHALATION LAYER, SAID SILVER HALIDE EMULSION HAVING AN AVERAGE SILVER HALIDE GRAIN SIZE OF 0.4 TO 1.2 MICRONS, AD AN X-RAY INTENSIFYING SCREEN IN CONTACT WITH SAID EMULSION LAYER, SAID EMULSION LAYER AND SCREEN HAVNG A SPEED FACTOR BETWEEN 2.5 AND 4.5.
Claim 3
Dependent Claim
17 words
A radiographic element of claim 1 wherein the silver halide average grain size is about one micron.
Claim 4
Dependent Claim
15 words
A radiographic element of claim 1 wherein the speed factor is between 3.0 and 4.2.
Claim 5
Dependent Claim
22 words
A radiographic element of claim 1 wherein said emulsion layer and screen are held in intimate contact in an evacuated vacuum cassette.
Claim 6
Dependent Claim
23 words
A radiographic element of claim 1 wherein said element has a modulation transfer function of at least 67.5 at 2 cycles per mm.
Claim 7
Dependent Claim
20 words
A method of making fine detail radiographs with low X-ray exposure comprising exposing the element of claim 1 to X-radiation.
Claim 8
Dependent Claim
28 words
A method according to claim 6 of making mammographic radiographs with fine detail at low exposure levels comprising exposing said element to X-radiation through a human female breast.
Claim 9
Dependent Claim
42 words
A method of claim 6 wherein exposing said element to X-rays in an amount between 4 to 20 milliampere seconds at a distance of 40 inches is capable of producing a developed image density of 1.0 on said sIlver halide emulsion layer.
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) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |