US3615566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photosensitive article and method of using same incorporating leuco dye precursors and fluorescein activators
Assignee: Arthur D Little Inc
•
Filing: 1969-05-08
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Granted: 1971-10-26
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Expires: 1989-05-08
Abstract
Abstract A direct printout photographic system suitable for photocopy work, particularly for microfilm blowups. A leuco base of a dior triarylmethane, xanthene, thioxanthene, selenaxanthene, anthracene or acridine dye and a halogen-substituted fluorescein derivative activator, supported in a binder or distributed within a portion of a substrate, form the photosensitive system which is activated when exposed to a range of electromagnetic radiation extending from ultraviolet through the visible spectrum. The system is adaptable to making monochrome and black-and-white prints and transparencies.
Inventors
- 👤 Ian D Robinson
- 👤 Joanne C Gerlach
- 👤 Richard P Muse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:04
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/72; G03C1/73; G03C1/732
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
16 words
A photosensitive composition in accordance with claim 1 wherein said dye precursor is leuco crystal violet.
Claim 2
Dependent Claim
17 words
an activator for said dye precursor which is a halogen-substituted fluorescein photoreducible dye of the general formula
Claim 3
Dependent Claim
15 words
A photosensitive composition in accordance with claim 1 wherein said dye precursor is 3,6-bis(dimethylamino)-9-(p-dimethylaminophenyl) xanthene.
Claim 4
Dependent Claim
15 words
A photosensitive composition in accordance with claim 1 wherein said dye precursor is leuco pararosaniline.
Claim 5
Dependent Claim
14 words
A photosensitive composition in accordance with claim 1 wherein said activator is eosin YB.
Claim 6
Dependent Claim
14 words
A photosensitive composition in accordance with claim 1 wherein said activator is erythrosin B.
Claim 7
Dependent Claim
14 words
A photosensitive composition in accordance with claim 1 wherein said activator is phloxine B.
Claim 8
Dependent Claim
14 words
A photosensitive composition in accordance with claim 1 wherein said activator is rose bengal.
Claim 9
Dependent Claim
14 words
A photosensitive composition in accordance with claim 1 which is activated by ultraviolet radiation.
Claim 10
Dependent Claim
14 words
A photosensitive composition in accordance with claim 1 which is activated by visible light.
Claim 11
Dependent Claim
24 words
A photosensitive composition in accordance with claim 1 wherein the mole ratio of activator to dye precursor ranges between about 0.01-to-1 to about 10-to-1.
Claim 12
Dependent Claim
16 words
A photosensitive composition in accordance with claim 1 wherein said composition is incorporated in a binder.
Claim 13
Dependent Claim
14 words
A photosensitive composition in accordance with claim 12 including a plasticizer for said binder.
Claim 14
Dependent Claim
13 words
A photosensitive composition in accordance with claim 12 wherein said binder is nitrocellulose.
Claim 15
Dependent Claim
13 words
A photosensitive composition in accordance with claim 12 wherein said binder is polystyrene.
Claim 16
Dependent Claim
28 words
A photosensitive composition in accordance with claim 1 including one or more additives serving as color filters, oxidation inhibitors and stabilizers, and fixing agents for said dye precursor.
Claim 17
Dependent Claim
24 words
A photosensitive composition in accordance with claim 16 wherein said additive is contained within capsules which may be broken by heating or through pressure.
Claim 18
Dependent Claim
20 words
A photosensitive composition in accordance with claim 16 wherein said additive is an encapsulated fixing agent for said dye precursor.
Claim 19
Dependent Claim
45 words
A photosensitive article suitable for exposure to radiant energy for forming an image by direct printout, comprising in combination a. a substrate; and b. at least one layer of a photosensitive composition affixed to said substrate in a binder, said photosensitive composition comprising in combination
Claim 20
Dependent Claim
15 words
A photosensitive article in accordance with claim 19 wherein said substrate is an opaque paper.
Claim 21
Dependent Claim
16 words
A photosensitive article in accordance with claim 19 wherein said substrate is an essentially transparent film.
Claim 22
Dependent Claim
57 words
A photosensitive article in accordance with claim 20 further characterized by having an intermediate coating layer interposed between said substrate and said layer of said photosensitive composition, said coating layer serving as a chemical barrier, as a modifier of the physical properties of said substrate, or as a modifier of the optical properties of said photosensitive composition.
Claim 23
Independent Claim
82 words
A method of forming an image of a transparency by direct printout, characterized by exposing a photosensitive article through said transparency to electromagnetic radiation of a predetermined wavelength range, said photosensitive article comprising in combination a dye precursor which is a leuco base of a di- or triarylmethane, xanthene, thioxanthene, selenaxanthene, anthracene or acridine dye and an activator which is a halogen-substituted fluorescein photoreducible dye, and fixing the image in the resulting print, said fluorescein dye being one having the general formula
Claim 24
Dependent Claim
18 words
A method in accordance with claim 23 wherein said transparency is placed in contact with said photosensitive article.
Claim 25
Dependent Claim
42 words
A method in accordance with claim 23, wherein optical elements adapted to project and enlarge an image are placed between said transparency and said photosensitive article whereby the image of said transparency is optically projected as an enlargement onto said photosensitive article.
Claim 26
Dependent Claim
25 words
A method in accordance with claim 23 wherein said fixing comprises removing at least the dye precursor which was not activated to form said image.
Claim 27
Dependent Claim
33 words
A method in accordance with claim 26 wherein said removing comprises washing said print with a liquid which is a solvent for said dye precursor and a nonsolvent for the dye image formed.
Claim 28
Dependent Claim
37 words
A method in accordance with claim 23 wherein said fixing comprises destroying the dye precursor which was not activated to form said image with a reactant capable of converting said dye precursor to a colorless, light-insensitive compound.
Claim 29
Dependent Claim
18 words
A method in accordance with claim 23 wherein saId fixing comprises applying an oxygen-barrier overcoat to said print.
Claim 30
Dependent Claim
28 words
A method in accordance with claim 23 wherein said fixing comprises applying an overcoat comprising a mixture of citric acid and allyl thiourea dissolved in a binder solution.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |