Patent US3900215A successfully refreshed from Google Patents.
US3900215A
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US
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Record sheet
Assignee: Fujifilm Holdings Corp
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Filing: 1973-01-22
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Granted: 1975-08-19
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Expires: 1993-01-22
Abstract
Abstract A record sheet comprising a base sheet and coated thereon a layer of a developer which produces a colored image upon reaction with a color former such as crystal violet lactone, said developer comprising (1) a metal compound of an aromatic carboxylic acid such as a reaction product of 2-hydroxy-1naphthoic acid and zinc chloride and (2) a metal salt such as copper sulfate or nickel sulfate. The developer has improved color developing ability and the colored image produced has increased resistance to light.
Inventors
- 👤 Hajime Kato
- 👤 Takao Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:31
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/155
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
65 words
A RECORD SHEET COMPRISING A BASE SHEET AND COATED THEREON A LAYER OF A DEVELOPER WHICH PRODUCES A COLORED IMAGE UPON CONTACT WITH AN ELECTRON-DONATING COLORLESS CHROMOGENIC MATERIAL, SAID DEVELOPER COMPRISING (1) A METAL COMPOUND OF AN AROMATIC CARBOXYLIC ACID AND (2) FROM 0.5 TO 10 PARTS BY WEIGHT PER 100 PARTS BY WEIGHT OF THE METAL COMPOUND (1) OF A SALT OF A METAL.
Claim 2
Dependent Claim
65 words
A RECORD SHEET COMPRISING A BASE SHEET AND COATED THEREON A LAYER OF A DEVELOPER WHICH PRODUCES A COLORED IMAGE UPON CONTACT WITH AN ELECTRON-DONATING COLORLESS CHROMOGENIC MATERIAL, SAID DEVELOPER COMPRISING (1) A METAL COMPOUND OF AN AROMATIC CARBOXYLIC ACID AND (2) FROM 0.5 TO 10 PARTS BY WEIGHT PER 100 PARTS BY WEIGHT OF THE METAL COMPOUND (1) OF A SALT OF A METAL.
Claim 3
Dependent Claim
20 words
The record sheet of claim 1 wherein (2) is a salt of a metal with an organic or inorganic acid.
Claim 4
Dependent Claim
33 words
The record sheet of claim 2, wherein said developer layer contains a binder in an amount of 5 to 20 parts by weight per 100 parts by weight of the metal compound (1).
Claim 5
Dependent Claim
41 words
The record sheet of claim 2, wherein said aromatic carboxylic acid constituting the metal compound (1) is selected from the group consisting of benzoic acid, benzoic acid derivatives, salicylic acid, salicylic acid derivatives, naphthoic acids, anacardic acid, toluic acids and 2-carboxybenzaldehyde.
Claim 6
Dependent Claim
27 words
The record sheet of claim 2, wherein said aromatic carboxylic acid constituting the metal compound (1) is an aromatic carboxylic acid containing at least one hydroxyl group.
Claim 7
Dependent Claim
21 words
The record sheet of claim 5 wherein at least one hydroxyl group is at the ortho position to the carboxyl group.
Claim 8
Dependent Claim
15 words
The record sheet of claim 2, wherein said organic acid is an aliphatic organic acid.
Claim 9
Dependent Claim
33 words
The record sheet of claim 2, wherein the metal of said metal compound (1) is selected from metals of Groups IB, IIA, IIB, IIIA, IVA, VIB, VIIB and VIII of the periodic table.
Claim 10
Dependent Claim
33 words
The record sheet of claim 8, wherein the metal is selected from the group consisting of copper, silver, magnesium, calcium, zinc, cadmium, mercury, aluminum, potassium, tin, lead, chromium, molybdenum, manganese, cobalt and nickel.
Claim 11
Dependent Claim
18 words
The record sheet of claim 2, wherein the metal of said metal compound (1) is zinc or tin.
Claim 12
Dependent Claim
28 words
The record sheet of claim 2, wherein the metal of said salt (2) is selected from the group consisting of copper, aluminum, manganese, nickel, silver, cobalt, and iron.
Claim 13
Dependent Claim
24 words
The record sheet of claim 2, wherein said salt (2) is selected from the group consisting of copper and nickel salts of inorganic acids.
Claim 14
Dependent Claim
34 words
The record sheet of claim 2, wherein said color former is a combination of a primary color former which yields a color instantaneously and a secondary color former which produces a color having fastness.
Claim 15
Dependent Claim
22 words
The record sheet of claim 13, wherein said color former is a combination of crystal violet lactone and benzoyl leuco methylene blue.
Claim 16
Dependent Claim
18 words
The record sheet of claim 2 wherein the aromatic carboxylic acid is substituted with an electron attracting group.
Claim 17
Dependent Claim
18 words
The record sheet of claim 2 wherein the aromatic carboxylic acid is from the benzene or naphthalene series.
Claim 18
Dependent Claim
14 words
The record sheet of claim 16 wherein the aromatic carboxylic acid is alkyl substituted.
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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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |