Patent US3934070A successfully refreshed from Google Patents.
US3934070A
Expired / Lapsed
US
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Recording sheet and color developer therefor
Assignee: Fujifilm Holdings Corp
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Filing: 1973-10-16
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Granted: 1976-01-20
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Expires: 1993-10-16
Abstract
Abstract A color developer is disclosed which, when contacted with a color former, is capable of forming a distinct color, the color developer comprising a metallic compound of an aromatic carboxylic acid. Suitable metals are, for example, those of the following groups of the Periodic Table: Ib, IIa, IIIb, IVb, VIa, VIIa and VIII. A recording sheet employing the color developer is also disclosed.
Inventors
- 👤 Shiro Kimura
- 👤 Sadao Ishige
- 👤 Hajime Kato
- 👤 Takao Hayashi
- 👤 Akio Miyamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:18
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/155; Y; Y10; Y10T; Y10T428/00; Y10T428/28
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
62 words
A recording sheet comprising a support having coated thereon a color former layer containing an electron donating or proton accepting colorless color former and a color developer layer containing a zinc, aluminum or tin salt of an aromatic carboxylic acid having an OH-group at the ortho-position as a color developer capable of forming a distinct color when contacted with said color former.
Claim 2
Dependent Claim
62 words
A recording sheet comprising a support having coated thereon a color former layer containing an electron donating or proton accepting colorless color former and a color developer layer containing a zinc, aluminum or tin salt of an aromatic carboxylic acid having an OH-group at the ortho-position as a color developer capable of forming a distinct color when contacted with said color former.
Claim 3
Dependent Claim
27 words
The recording sheet of claim 1 wherein said zinc, aluminum or tin salt is coated onto said suppport in an amount greater than 0.1 g/m 2 .
Claim 4
Dependent Claim
21 words
The recording sheet of claim 1 wherein said color developer layer further comprises an alkali metal salt of an organic acid.
Claim 5
Dependent Claim
36 words
The recording sheet of claim 1 wherein said color developer layer further comprises from 0.01 to one part by weight, for one part by weight of said zinc, aluminum or tin salt, of an alkali compound.
Claim 6
Dependent Claim
22 words
The recording sheet of claim 1 wherein said color former and said color developer are on the same surface of said support.
Claim 7
Dependent Claim
21 words
The recording sheet of claim 1 wherein said color former and said color developer are on opposite surfaces of said support.
Claim 8
Dependent Claim
16 words
The recording sheet of claim 1 wherein said color developer layer further contains an inorganic pigment.
Claim 9
Dependent Claim
38 words
The recording sheet of claim 7 wherein said inorganic pigment is added to said color developer layer in an amount greater than one part by weight per 100 parts by weight of said zinc, aluminum or tin salt.
Claim 10
Dependent Claim
69 words
A recording system comprising a first support having coated thereon a color former layer containing an electron donating or proton excepting colorless color former and a second support having coated thereon a color developer layer containing a zinc, aluminum or tin salt of an aromatic carboxylic acid having an OH-group at the ortho-position as a color developer capable of forming a distinct color when contacted with said color former.
Claim 11
Dependent Claim
69 words
A recording system comprising a first support having coated thereon a color former layer containing an electron donating or proton excepting colorless color former and a second support having coated thereon a color developer layer containing a zinc, aluminum or tin salt of an aromatic carboxylic acid having an OH-group at the ortho-position as a color developer capable of forming a distinct color when contacted with said color former.
Claim 12
Dependent Claim
16 words
The recording system of claim 9 wherein said color developer layer further contains an inorganic pigment.
Claim 13
Dependent Claim
27 words
The recording system of claim 9 wherein said zinc, aluminum or tin salt is coated onto said support in an amount greater than 0.1 g/m 2 .
Claim 14
Dependent Claim
38 words
The recording system of claim 9 wherein said inorganic pigment is added to said color developer layer in an amount greater than one part by weight per 100 parts by weight of said zinc, aluminum or tin salt.
Claim 15
Dependent Claim
21 words
The recording system of claim 9 wherein said color developer layer further comprises an alkali metal salt of an organic acid.
Claim 16
Dependent Claim
36 words
The recording system of claim 9 wherein said color developer layer further comprises from 0.01 to one part by weight, for one part by weight of said zinc, aluminum or tin salt, of an alkali compound.
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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) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |