US3630733A
Expired / Lapsed
US
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Photographic systems and processes having heat alterable spectral sensitivity
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1968-01-12
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Granted: 1971-12-28
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Expires: 1988-01-12
Abstract
Abstract Reproduction systems having broader spectral sensitivity are produced wherein certain classes of dyes are added to photosensitive materials which, when activated, are capable of producing chemical reaction when in contact with image-forming agents to produce a visible image. The dyes are those which undergo a color change when heated to elevated temperatures and thus alter the spectral sensitivity of the photosensitive materials after heating. The dyes include styryl dyes substituted on the vinyl group by a nitrogen-containing heterocyclic, which in their unaltered state, themselves alter the sensitivity of the reproduction system. Improved processes using this improved reproduction system comprise selectively exposing the present systems to activating radiation after heating to the color transition temperature or alternatively first exposing and then heating to the said temperature. A preferred process is an add-on technique for addition of images to a reproduction system in which readable images are already present. The new reproduction systems of this invention have a built-in differential in spectral sensitivity by virtue of alteration of the dye by heating.
Inventors
- 👤 John R Manhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:33
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/09; G03C; G03C1/00; G03C1/705; G03G5/06; G03G5/0664
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
46 words
Method as in claim 2 wherein the substituent A is selected from the group consisting of a thiazole nucleus, isoxazole nucleus, quinoline nucleus, benzimidazole nucleus, indole nucleus, benzothiazole nucleus and thiadiazole nucleus, said dye being in the form of a quaternary salt or acid addition salt.
Claim 2
Dependent Claim
19 words
Method as in claim 2 wherein the heating is conducted at a temperature of at least about 200* F.
Claim 3
Dependent Claim
12 words
Method as in claim 2 wherein the dye is 4-methyl-2-(p-dimethylaminostyryl) thiazole methochloride.
Claim 4
Dependent Claim
11 words
Method as in claim 2 wherein the dye is 2-(p-(dimethylamino)styryl)-3,5-dimethylthiadiazolium nitrate.
Claim 5
Dependent Claim
17 words
Method as in claim 5 wherein the heating is conducted at a temperature of about 400* F.
Claim 6
Independent Claim
106 words
A method of forming an image in a photosensitive medium comprising a metal-containing photoconductor that is not sensitive to red light radiation and which has been contacted with a dye of the formula: A-CR3 CR4-C6H4 N R1R2 in which substituent A is a nitrogen-containing heterocyclic nucleus and substituents R1, R2, R3, and R4 are each selected from the group consisting of hydrogen, alkyl, aralkyl, aryl and alkaryl groups, comprising the steps of: a. exposing the medium to an image with red light; b. heating the medium to at least the color transition temperature of the dye to form a latent image corresponding to the original image.
Claim 7
Dependent Claim
13 words
Method as in claim 7 wherein step b is conducted before step a.
Claim 8
Dependent Claim
14 words
Method as in claim 7 wherein step a is conducted simultaneous with step b.
Claim 9
Dependent Claim
31 words
Method as in claim 7 wherein the latent image is rendered visible by contact with an image-forming agent which undergoes an oxidation/reduction type reaction upon contact with an exposed, activated photoconductor.
Claim 10
Dependent Claim
28 words
Method as in claim 10 wherein the image-forming agent comprises a solution of a metal ion which is at least as strong an oxidizing agent as copper ion.
Claim 11
Dependent Claim
12 words
Method as in claim 11 wherein the metal ion is silver ion.
Claim 12
Dependent Claim
16 words
Method as in claim 11 wherein the solution includes a reducing agent for the metallic ion.
Claim 13
Dependent Claim
107 words
Method of adding an image to a photosensitive medium comprising a metal-containing photoconductor already containing a visible image thereon which comprises the successive steps of: a. Contacting the photoconductor with a dye of the formula: A-CR3 CR4-C6H4 N R1R2 wherein substituent A is a nitrogen-containing heterocyclic nucleus and substituents R1, R2, R3, and R4 are each selected from the group consisting of hydrogen, alkyl, aralkyl, aryl and alkaryl groups; b. registering an image on the medium with red light; c. heating the medium after registering the image to at least the color transition temperature of the dye to form a latent image corresponding to the registered image.
Claim 14
Dependent Claim
31 words
Method as in claim 14 wherein the latent image is rendered visible by contact with an image-forming agent which undergoes an oxidation/reduction type reaction upon contact with an exposed, activated photoconductor.
Claim 15
Dependent Claim
29 words
Method as in claim 15 wherein the image forming agent comprises a solution of a metal ion which is at least as strong an oxidizing agent as copper ion.
Claim 16
Dependent Claim
12 words
Method as in claim 16 wherein the metal ion is silver ion.
Claim 17
Dependent Claim
16 words
Method as in claim 16 wheRein the solution includes a reducing agent for the metallic ion.
Claim 18
Dependent Claim
46 words
Method as in claim 15 wherein the substituent A is selected from the group consisting of a thiazole nucleus, isoxazole nucleus, quinoline nucleus, benzimidazole nucleus, indole nucleus, benzothiazole nucleus and thiadiazole nucleus, said dye being in the form of a quaternary salt or acid additional salt.
Claim 19
Dependent Claim
19 words
Method as in claim 19 wherein the heating is conducted at a temperature of at least about 200* F.
Claim 20
Dependent Claim
12 words
Method as in claim 14 wherein the dye is 4-methyl-2-(p-(dimethylamino)styryl) thiazole methochloride.
Claim 21
Dependent Claim
11 words
Method as in claim 14 wherein the dye is 2-(p-(dimethylamino)styryl)-3,5-dimethylthiadiazolium nitrate.
Claim 22
Dependent Claim
17 words
Method as in claim 22 wherein the heating is conducted at a temperature of about 400* F.
Claim 23
Dependent Claim
64 words
A photosensitive medium comprised of a metal containing photoconductor and a dye of the formula: A-CR3 CR4-C6H4 N R1R2 wherein substituent A is a nitrogen heterocyclic nucleus; and substituents R1, R2, R3 and R4 are each selected from the group consisting of hydrogen, alkyl, aralkyl, aryl and alkaryl groups; the medium having been heated to at least the color transition temperature of the dye.
Claim 24
Dependent Claim
11 words
Medium as in claim 25 wherein the photoconductor comprises titanium dioxide.
Claim 25
Dependent Claim
28 words
Medium as in claim 25 wherein the photoconductor is titanium dioxide of an average particle size of 250 millimicrons or less and the dye is 4-methyl-2-(p-(dimethylamino)styryl) thiazole methochloride.
Claim 26
Dependent Claim
27 words
Medium as in claim 25 wherein the photoconductor is titanium dioxide of an average particle size of 250 millimicrons or less and the dye is 2-(p-(dimethylamino)styryl)-3,5-dimethylthiadiazolium nitrate.
Claim 27
Dependent Claim
46 words
Medium as in claim 25 wherein the substituent A is selected from the group consisting of a thiazole nucleus, isoxazole nucleus, quinoline nucleus, benzimidazole nucleus, indole nucleus, benzothiazole nucleus and thiadiazole nucleus, said dye being in the form of a quaternary salt or acid additional salt.
Claim 28
Dependent Claim
12 words
Medium as in claim 25 wherein the dye is 4-methyl-2-(p-(dimethylamino)styryl) thiazole methochloride.
Claim 29
Dependent Claim
11 words
Medium as in claim 25 wherein the dye is 2-(p-(dimethylamino)styryl)-3,5-dimethylthiadiazolium nitrate.
Claim 30
Independent Claim
106 words
A method of recording a latent image which comprises heating imagewise a copy medium comprising a photosensitive metal containing semiconductor and a sensitizing dye which undergoes a color change upon such heating and then exposing the copy medium to radiation which will selectively activate the heated portions of the copy medium and wherein the dye is of the formula A-CR3 CR4-C6H4 N R1R2 in which substituent A is a nitrogen heterocyclic nucleus; and substituents R1, R2, R3 and R4 are each selected from the group consisting of hydrogen, alkyl, aralkyl, aryl and alkaryl groups; and heating to at least the color transition temperature of the dye.
Claim 31
Dependent Claim
33 words
A method as in claim 31 comprising additionally contacting with image forming materials comprising a solution of metal ions to form a permanent, irreversible image in the activated portions of the copy medium.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |