US3607266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image intensification process for sensitized film
Assignee: Bell and Howell Co
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Filing: 1967-04-17
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Granted: 1971-09-21
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Expires: 1987-04-17
Abstract
Abstract Methods for increasing the effective speed of photosensitive compositions and compositions modified to be sensitive to light levels lower than ordinarily useful for inducing a developable latent image. Such image is induced and is intensified upon exposure to radiation in a spectral region to which the unmodified composition has comparably low sensitivity.
Inventors
- 👤 Yoshikazu Yamada
- 👤 Thomas H Garland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:08
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/675; G03C1/72; G03C1/73; G03C5/00; G03C5/56; G09; G09B; G09B19/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
238 words
In a photographic process in which a photosensitive composition is imagewise exposed, an image is formed therein and color is developed in either the imagewise-exposed areas or nonimagewise-exposed areas of said composition, said composition including a photoinitiator component which produces free radicals or ions upon exposure to light of a suitable wavelength, the improvement comprising the steps, prior to complete color development, of: incorporating in said composition a sensitizing amount of photographic spectral sensitizing dye or dye base compound having a ring structure and which enables an image to be developed in said composition following exposure to actinic radiation normally insufficient to produce said image, said dye or dye base compound being different from other components of said composition and being chosen so that said sensitized composition has (1) relatively low or no photosensitivity to light of a second spectral region, (2) high photosensitivity to light of a second spectral region, (3) photosensitivity to light of a third spectral region in portions of said sensitized composition which have been previously exposed to light of said second spectral region, and (4) a coincident range in said first and third spectral regions; imagewise exposing said sensitized composition with light of said second spectral region sufficient to radiatively modify said composition to constitute a latent image; and blanket exposing said imagewise-exposed composition with light of said coincident range to further radiatively modify those portions of the composition constituting said latent image.
Claim 2
Dependent Claim
17 words
The process of claim 2 in which said spectral sensitizing compound is a dye in base form.
Claim 3
Dependent Claim
18 words
The process of claim 2 wherein said photosensitive composition is dispersed in particulate form in a binder therefore.
Claim 4
Dependent Claim
13 words
The process of claim 2 wherein said photosensitive composition comprises organic color-forming material.
Claim 5
Dependent Claim
23 words
The process of claim 2 wherein said photosensitive composition is dispersed in a binder in which the photosensitive components thereof are substantially insoluble.
Claim 6
Dependent Claim
34 words
The process of claim 2 wherein the imagewise exposure is at a level that is normally too low to form a developable latent image in said photosensitive composition in absence of said blanket exposure.
Claim 7
Dependent Claim
12 words
The process of claim 6 wherein the nonsolubilizing binder is water soluble.
Claim 8
Dependent Claim
20 words
The process of claim 3 wherein the spectral sensitizing compound is selected from styryl dye bases and vinyl homologs thereof.
Claim 9
Dependent Claim
47 words
The process of claim 9 wherein light of said second spectral region comprises visible light including substantial portions of wavelengths of from about 3,500 to about 5,500 A. and light of said coincident range includes substantial portions of wavelengths of from about 6,000 to about 7,200 A.
Claim 10
Dependent Claim
49 words
The process of claim 2 wherein the photoinitiator component comprises an organic halogen compound in which there is present at least one active halogen selected, selected from the group consisting of chlorine, bromine and iodine, attached to a carbon atom having not more than one hydrogen atom attached thereto.
Claim 11
Dependent Claim
18 words
The process of claim 2 wherein said photosensitive composition includes an aromatic amine as a color-forming component thereof.
Claim 12
Dependent Claim
18 words
The process of claim 2 wherein said photosensitive composition includes an N-vinyl compound as a color-forming component thereof.
Claim 13
Dependent Claim
132 words
A process which comprises: imagewise exposing to visible light a composition comprising a dispersion, in a water-soluble continuous phase, of a combination obtained by combining (a) photoreactive proportions of N-vinylcarbazole and an organic halogen compound having the formula BR-C-(X) (X'') (X'''')n(CY3)1 n wherein X, X'' and X'''' are halogens, each Y is independently selected from the group consisting of halogen, hydrogen, hydroxy, methyl and methylol, and ''''n'''' is selected from 0 and 1, such that when ''''n'''' is 0, X and X'' are Br, with (b) an optical sensitizing dye in base form selected from styryl dye bases and vinyl homologs thereof, to induce at least a latent image therein, and intensifying the latent image with electromagnetic radiation including substantial portions of wavelengths of from about 6, 000 to about 7,200 A.
Claim 14
Dependent Claim
103 words
The process of claim 20 in which said N-vinyl compound is capable of yielding color and noncolor areas in respective responsive to high and low levels of exposure and wherein said blanket exposure is chosen to be at a level insufficient to substantially yield a color, but sufficient to deactivate imagewise-exposed areas against color formation, and said composition is sequentially further blanket exposed to radiation in the region of original sensitivity of the composition with light of said second spectral region at a wavelength or level sufficient to yield color in areas exclusively of said imagewise-exposed areas, thereby effecting a positive-working photographic process.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |