Patent US3996397A successfully refreshed from Google Patents.
US3996397A
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US
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Thermographic recording process
Assignee: Agfa Gevaert NV
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Filing: 1974-04-03
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Granted: 1976-12-07
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Expires: 1994-04-03
Abstract
Abstract A recording process, wherein an organic reducing compound being present in a supported or self-supporting layer and corresponding to one of the following general formulae (I) and (II): ##EQU1## wherein: R 1 represents hydrogen, an aliphatic group of a cycloaliphatic group, and R 2 represents an aliphatic oxy group, a cycloaliphatic oxy group, an aryloxy group, an amino group of the formula ##EQU2## in which R 3 and R 4 (same or different) represent hydrogen, an aliphatic, a cycloaliphatic or an aromatic group or R 3 and R 4 represent together the necessary atoms to close a heterocyclic nitrogen containing nucleus; ##EQU3## wherein: R 5 represents an aliphatic, cycloaliphatic, aromatic or heterocyclic group, is caused to effect in said layer under the influence of information-wise heating an information-wise reduction of a reducible reaction partner.
Inventors
- 👤 Urbain Leopold Laridon
- 👤 Albert Lucien Poot
- 👤 Jozef Frans Willems
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:30
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/494; G03C1/498; G03C1/4989; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
175 words
A recording process, which comprises exposing to a heat pattern a support carrying an organic reducing compound corresponding to one of the following general formulae: ##EQU8## wherein: R 1 represents hydrogen, an aliphatic group containing up to about four carbon atoms; and R 2 represents an alkoxy group containing up to 18 carbon atoms, an aryloxy group, an amino group of the formula ##EQU9## in which R 3 and R 4 (same or different) represent hydrogen, an aliphatic group or an aromatic group, or R 3 and R 4 represent together the necessary atoms to close a 5- or 6-membered heterocyclic nitrogen containing nucleus; and ##EQU10## wherein: R 5 represents an aliphatic group containing up to 18 carbon atoms, an aromatic group or a 5- or 6-membered heterocyclic group; and a reducible noble metal salt of an aliphatic carboxylic acid, said organic reducing compound being present in an effective amount to reduce said noble metal salt and said heat pattern having a temperature of at least about 60° C and sufficient to initiate said reduction.
Claim 2
Dependent Claim
175 words
A recording process, which comprises exposing to a heat pattern a support carrying an organic reducing compound corresponding to one of the following general formulae: ##EQU8## wherein: R 1 represents hydrogen, an aliphatic group containing up to about four carbon atoms; and R 2 represents an alkoxy group containing up to 18 carbon atoms, an aryloxy group, an amino group of the formula ##EQU9## in which R 3 and R 4 (same or different) represent hydrogen, an aliphatic group or an aromatic group, or R 3 and R 4 represent together the necessary atoms to close a 5- or 6-membered heterocyclic nitrogen containing nucleus; and ##EQU10## wherein: R 5 represents an aliphatic group containing up to 18 carbon atoms, an aromatic group or a 5- or 6-membered heterocyclic group; and a reducible noble metal salt of an aliphatic carboxylic acid, said organic reducing compound being present in an effective amount to reduce said noble metal salt and said heat pattern having a temperature of at least about 60° C and sufficient to initiate said reduction.
Claim 3
Dependent Claim
30 words
A recording process according to claim 1, wherein R 2 is the group ##EQU11## and R 3 and R 4 represent together the necessary atoms to close a piperidine nucleus.
Claim 4
Dependent Claim
25 words
A recording process according to claim 1, wherein R 2 is the group ##EQU12## and R 3 represents hydrogen and R 4 an alkyl group.
Claim 5
Dependent Claim
22 words
A recording process according to claim 1, wherein the reaction partner is a noble metal salt which upon reduction yields free metal.
Claim 6
Dependent Claim
28 words
A recording process according to claim 1, wherein the reaction partner is a silver salt, which in the temperature range of 50° to 200° C is generally non-light-sensitive.
Claim 7
Dependent Claim
24 words
A recording process according to claim 5, wherein the silver compound is a silver salt of an aliphatic carboxylic acid containing a thioether group.
Claim 8
Dependent Claim
26 words
A recording process according to claim 5, wherein the silver compound is a silver salt of an aliphatic carboxylic acid containing at least 13 carbon atoms.
Claim 9
Dependent Claim
17 words
A recording process according to claim 7, wherein the silver salt is silver behenate or silver stearate.
Claim 10
Dependent Claim
28 words
A recording process according to claim 4, wherein the organic reducing agent is used in an amount of at least 0.25 mole per mole of noble metal salt.
Claim 11
Dependent Claim
35 words
A recording process according to claim 1, wherein the organic reducing compound and noble metal salt are present in a sheet material and are heated information-wise in a temperature range of 60° to 200° C.
Claim 12
Dependent Claim
17 words
The process of claim 1, wherein said noble metal salt undergoes a visible color change when reduced.
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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) | 1979-12-07 | 1980-06-07 | 1980-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-07 | 1984-06-07 | 1984-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-07 | 1988-06-07 | 1988-12-07 | $7700.00 | Window Closed / Lapsed |