Patent US4296948A successfully refreshed from Google Patents.
US4296948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color-developing sheet for no-carbon copying process
Assignee: Appvion LLC
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Filing: 1979-11-28
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Granted: 1981-10-27
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Expires: 1999-11-28
Abstract
Abstract A color-developing sheet for use in no-carbon copying system, which contains a layer of a combination of a solid acid with an acidic polymer is improved in preventing yellowing during the preservation thereof, in giving high color intensity and stability to image formed, by incorporating titanium dioxide into the layer.
Inventors
- 👤 Tsutomu Satoh
- 👤 Hideo Ohye
- 👤 Hirokazu Tsukahara
- 👤 Hideaki Senoh
- 👤 Takahiro Torii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:08
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/155; Y; Y10; Y10S; Y10S428/00; Y10S428/914; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/31504; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
86 words
A color-developing pressure sensitive sheet for use in no-carbon copying system, comprising a support and an electron-accepting color-developing layer thereon of a combination of a phenol-formaldehyde resin with a solid acid which is an active silicic acid, which are capable of developing color upon reacting with an electron-donating colorless dye, characterized in that titanium dioxide is incorporated into the said electron-accepting color-developing layer in an amount of from about 2 to about 4 parts by weight based on one part by weight of the phenol-formaldehyde resin.
Claim 2
Dependent Claim
86 words
A color-developing pressure sensitive sheet for use in no-carbon copying system, comprising a support and an electron-accepting color-developing layer thereon of a combination of a phenol-formaldehyde resin with a solid acid which is an active silicic acid, which are capable of developing color upon reacting with an electron-donating colorless dye, characterized in that titanium dioxide is incorporated into the said electron-accepting color-developing layer in an amount of from about 2 to about 4 parts by weight based on one part by weight of the phenol-formaldehyde resin.
Claim 3
Dependent Claim
15 words
A color-developing sheet as claimed in claim 1, in which the titanium dioxide is rutile.
Claim 4
Dependent Claim
15 words
A color-developing sheet according to claim 2 wherein the solid acid is an active clay.
Claim 5
Dependent Claim
26 words
A color-developing sheet according to claim 3 in which the combination ratio of the phenolformaldehyde resin with the solid acid is in the range of 1:2-16.
Claim 6
Dependent Claim
17 words
A color-developing sheet as claimed in claim 1, in which the solid acid is an active clay.
Claim 7
Dependent Claim
26 words
A color-developing sheet according to claim 5 in which the combination ratio of the phenol-formaldehyde resin with the solid acid is in the range of 1:2-16.
Claim 8
Dependent Claim
27 words
A color-developing sheet as claimed in claim 1, in which the combination ratio of the phenolformaldehyde resin with the solid acid is in the range of 1:2-16.
References Cited (Backward Citations)
US4054718A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |