US5234797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical recording medium
Assignee: Nippon Paper Industries Co Ltd
•
Filing: 1990-02-20
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Granted: 1993-08-10
•
Expires: 2010-02-20
Abstract
Abstract In an optical recording medium, a light absorbent can be incorporated into a color-developing layer without separately constituting a light absorbing layer by holding the light absorbent in a dispersed or dissolved state in a solvent soluble or heat fusible material. Thus, an optical recording medium which exhibits satisfactory image density with a small amount of the light absorbent can be provided.
Inventors
- 👤 Toshimi Satake
- 👤 Tomoaki Nagai
- 👤 Hiroshi Fukui
- 👤 Miyuki Yokoyama
- 👤 Akio Sekine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:37
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/337; B41M5/3375; B41M5/40; B41M5/46; B41M5/465; G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; B41M5/323; B41M5/333; Y; Y10; Y10S; Y10S430/00; Y10S430/145; Y10S430/146
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
53 words
An optical recording medium having, on a substrate, a color-developing layer comprising: particles containing color-developing materials capable of developing color by thermal reaction with each other and a light absorbent capable of emitting heat by absorption of light being dissolved or dispersed in either a solvent soluble material or a heat fusible material.
Claim 2
Dependent Claim
53 words
An optical recording medium having, on a substrate, a color-developing layer comprising: particles containing color-developing materials capable of developing color by thermal reaction with each other and a light absorbent capable of emitting heat by absorption of light being dissolved or dispersed in either a solvent soluble material or a heat fusible material.
Claim 3
Dependent Claim
17 words
The optical recording medium according to claim 1 wherein the light absorbent is a near infrared absorbent.
Claim 4
Dependent Claim
27 words
The optical recording medium according to claim 1 or claim 2 wherein the color-developing materials are an electron donating colorless dye and an electron accepting acid material.
Claim 5
Dependent Claim
21 words
The optical recording medium according to claim 3 wherein the electron accepting acid material is an electron accepting organic acid material.
Claim 6
Dependent Claim
59 words
An optical recording medium having, on a substrate, a color-developing layer comprising: particles containing color-developing materials capable of developing color by thermal reaction with each other; second particles containing a heat fusible material capable of accelerating the color-developing reaction; and a light absorbent capable of emitting heat by absorption of light being dissolved or dispersed the heat fusible material.
Claim 7
Dependent Claim
59 words
An optical recording medium having, on a substrate, a color-developing layer comprising: particles containing color-developing materials capable of developing color by thermal reaction with each other; second particles containing a heat fusible material capable of accelerating the color-developing reaction; and a light absorbent capable of emitting heat by absorption of light being dissolved or dispersed the heat fusible material.
Claim 8
Dependent Claim
24 words
The optical recording medium according to claim 5 wherein the heat fusible material has a melting point lower than that of the color-developing materials.
Claim 9
Dependent Claim
17 words
The optical recording medium according to claim 5, wherein the light absorbent is a near infrared absorbent.
Claim 10
Dependent Claim
24 words
The optical recording medium according to claim 5, wherein the color-developing materials are an electron donating colorless dye and an electron accepting acid material.
Claim 11
Dependent Claim
21 words
The optical recording medium according to claim 8, wherein the electron accepting acid materials is an electron accepting organic acid material.
References Cited (Backward Citations)
US3219818A
Cited
US3793025A
Cited
US3679410A
Cited
US3619157A
Cited
US3628953A
Cited
US4259424A
Cited
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Cited
JPS57182483A
Cited
JPS57189888A
Cited
JPS5894494A
Cited
GB2112160A
Cited
JPS58209594A
Cited
US4788128A
Cited
US4816386A
Cited
GB2198855A
Cited
GB2200220A
Cited
JPS63272702A
Cited
US4933269A
Cited
US5075146A
Cited
US5061536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-09 | 1997-02-08 | 1997-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-09 | 2001-02-08 | 2001-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-09 | 2005-02-08 | 2005-08-10 | $7700.00 | Window Closed / Lapsed |