US3844797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photosensitive recording material
Assignee: Agfa Gevaert NV
•
Filing: 1972-12-29
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Granted: 1974-10-29
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Expires: 1992-12-29
Abstract
Abstract WHEREIN: R represents 1. AN ALIPHATIC GROUP INCLUDING A CYCLOALIPHATIC GROUP AND SUCH GROUPS IN SUBSTITUTED FORM, 2. AN ARYL GROUP INCLUDING A SUBSTITUTED ARYL GROUP, 3. A HETEROCYCLIC GROUP INCLUDING A SUBSTITUTED HETEROCYCLIC GROUP, OR 4. AN ACYL GROUP. Photographic recording material with a light-sensitive layer comprising a substantially non-light-sensitive silver salt, a reducing agent, a toning agent and in admixture therewith a light-sensitive heavy metal compound and/or a polymethine sensitizing agent for the spectral sensitization of the nonlight-sensitive silver compound, wherein the light-sensitive layer comprises a phthalazinone toning agent according to the following general formula:
Inventors
- 👤 F Heugebaert
- 👤 A Vandenberghe
- 👤 J Willems
- 👤 A Poot
- 👤 Konig A Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:13
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/494; G03C1/498; G03C1/49836; G03C1/49845; Y; Y10; Y10S; Y10S430/00; Y10S430/166
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
63 words
IN A PHOTOGRAPHIC RECORDING MATERIAL HAVING A LIGHTSENSITIVE LAYER COMPRISING A SUBSTANTIALLY NON-LIGHT-SENSITIVE SILVER SALT, A REDUCING AGENT, A TONING AGENT AND IN ADMIXTURE THEREWITH A LIGHT-SENSITIVE HEAVY METAL COMPOUND AND/OR A POLYMETHINE SENSITIZING AGENT FOR THE SPECTRAL SENSITIZATION OF THE NON-LIGHT SENSITIVE SILVER COMPOUND, THE IMPROVEMENT WHERE IN THE LIGHT-SENSITIVE LAYER COMPRISES A PHTHALAZINONE TONING AGENT ACCORDING TO THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
63 words
IN A PHOTOGRAPHIC RECORDING MATERIAL HAVING A LIGHTSENSITIVE LAYER COMPRISING A SUBSTANTIALLY NON-LIGHT-SENSITIVE SILVER SALT, A REDUCING AGENT, A TONING AGENT AND IN ADMIXTURE THEREWITH A LIGHT-SENSITIVE HEAVY METAL COMPOUND AND/OR A POLYMETHINE SENSITIZING AGENT FOR THE SPECTRAL SENSITIZATION OF THE NON-LIGHT SENSITIVE SILVER COMPOUND, THE IMPROVEMENT WHERE IN THE LIGHT-SENSITIVE LAYER COMPRISES A PHTHALAZINONE TONING AGENT ACCORDING TO THE FOLLOWING GENERAL FORMULA:
Claim 3
Dependent Claim
26 words
Photographic recording material according to claim 1, wherein the light-sensitive layer comprises a silver salt of a long chain fatty acid as said non-light-sensitive silver salt.
Claim 4
Dependent Claim
17 words
Photographic recording material according to claim 1, wherein said silver salT is silver behenate or silver stearate.
Claim 5
Dependent Claim
21 words
Photographic recording material according to claim 1, wherein the light-sensitive layer comprises a silver halide as said light-sensitive heavy metal compound.
Claim 6
Dependent Claim
31 words
Photographic recording material according to claim 1, wherein the light-sensitive layer contains 0.05 to 0.02 percent by weight of light-sensitive heavy metal compound calculated on the weight of non-light-sensitive silver salt.
Claim 7
Dependent Claim
28 words
Photographic recording material according to claim 1, wherein the phthalazinone toning agent is present in a molar proportion of at least 0.5 calculated on the non-light-sensitive silver salt.
Claim 8
Dependent Claim
39 words
Photographic recording material according to claim 1, wherein the light-sensitive layer comprises as the sole silver compound therein a non-light-sensitive silver salt, a reducing agent, and a polymethine sensitizing agent for the spectral sensitization of the non-light-sensitive silver salt.
References Cited (Backward Citations)
US3107174A
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US3080254A
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US3446648A
Cited
US3460946A
Cited
US3589903A
Cited
US3589901A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |