US4616239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4-hydroxy-4'-isopropoxydiphenylsulfone and its use for color-developable recording material
Assignee: Shin Nisson Kako Co Ltd
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Filing: 1985-09-16
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Granted: 1986-10-07
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Expires: 2005-09-16
Abstract
Abstract 4-Hydroxy-4'-isopropoxydiphenylsulfone useful as color developer for heat-sensitive color-developable recording material.
Inventors
- 👤 Masakichi Yahagi
- 👤 Tetsuo Igaki
- 👤 Shinji Yoshinaka
- 👤 Kosaku Morita
- 👤 Kimiaki Kinoshita
- 👤 Masashi Enokiya
- 👤 Akio Kaneko
- 👤 Toshiyuki Yamashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:52
CPC Classifications
C; C07; C07C; C07C317/00; B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/333; B41M5/3333; B41M5/3335
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
34 words
A heat-sensitive color-developable recording material comprising 4-hydroxy-4'-isopropoxydiphenylsulfone and a colorless or light-colored dye which develops a color under the action of an acidic substance in a layer on a surface of a supporting material.
Claim 2
Dependent Claim
34 words
A heat-sensitive color-developable recording material comprising 4-hydroxy-4'-isopropoxydiphenylsulfone and a colorless or light-colored dye which develops a color under the action of an acidic substance in a layer on a surface of a supporting material.
Claim 3
Dependent Claim
20 words
The heat-sensitive color-developable recording material of claim 1, wherein the layer further contains a binder, a filler and a sensitizer.
Claim 4
Dependent Claim
17 words
The heat-sensitive color-developable recording material of claim 2, wherein the sensitizer is dibenzyl terephthalate or dibenzyl isophthalate.
Claim 5
Dependent Claim
17 words
The heat-sensitive color-developable recording material of claim 3 wherein the supporting material is a sheet of paper.
Claim 6
Dependent Claim
17 words
The heat-sensitive color-developable recording material of claim 2, wherein the supporting material is a sheet of paper.
Claim 7
Dependent Claim
18 words
The heat-sensitive color-developable recording material of claim 1, wherein the layer further contains a binder and a filter.
Claim 8
Independent Claim
40 words
A method of recording by development of color, which comprises intimately contacting 4-hydroxy-4'-isopropoxy-diphenylsulfone with a colorless or light-colored dye which develops a color under the action of an acidic substance in a layer on a surface of a supporting material.
Claim 9
Independent Claim
40 words
A method of recording by development of color, which comprises intimately contacting 4-hydroxy-4'-isopropoxy-diphenylsulfone with a colorless or light-colored dye which develops a color under the action of an acidic substance in a layer on a surface of a supporting material.
Claim 10
Dependent Claim
26 words
The method of claim 7, wherein the contacting is carried out in the presence of a binder, a filler and a sensitizer contained in the layer.
Claim 11
Dependent Claim
14 words
The method of claim 8, wherein the sensitizer is dibenzyl terephthalate or dibenzyl isophthalate.
Claim 12
Dependent Claim
14 words
The method of claim 9, wherein the supporting material is a sheet of paper.
Claim 13
Dependent Claim
14 words
The method of claim 8 wherein the supporting material is a sheet of paper.
Claim 14
Dependent Claim
14 words
The method of claim 7, wherein the supporting material is a sheet of paper.
Claim 15
Dependent Claim
20 words
The method of claim 7, wherein the contacting is carried out in the presence of a binder and a filler.
References Cited (Backward Citations)
JPS57210886A
Cited
US4453744A
Cited
JPS5820493A
Cited
JPS5882788A
Cited
US4446209A
Cited
WO1984002882A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-06 | 1990-04-07 | 1990-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-06 | 1994-04-07 | 1994-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-06 | 1998-04-07 | 1998-10-07 | $7700.00 | Window Closed / Lapsed |