Patent US5075146A successfully refreshed from Google Patents.
US5075146A
Expired / Lapsed
US
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Optical recording medium
Assignee: Nippon Paper Industries Co Ltd
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Filing: 1989-10-25
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Granted: 1991-12-24
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Expires: 2009-10-25
Abstract
Abstract A novel optical recording medium is here disclosed in which an underlayer and a heat-sensitive color-developing layer are laminated in this order onto a base material, the underlayer containing a near infrared absorbent, the heat-sensitive color-developing layer containing a basic colorless dye and an organic developer. The near infrared absorbent may be a dispersible near infrared absorbent which absorbs a wave length in a near infrared region of 0.7 to 2.5 μm, and this dispersible near infrared absorbent is graphite, copper sulfide, lead sulfide, black titanium or tri-iron tetroxide. A transparent protective layer may be superimposed on the heat-sensitive color-developing layer.
Inventors
- 👤 Toshimi Satake
- 👤 Tomoaki Nagai
- 👤 Hiroshi Fukui
- 👤 Akio Sekine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:00
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/40; B41M5/42; B41M5/46; B41M5/465; B41M5/30; B41M5/426; B41M5/44; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/145; Y10S430/146; Y10S430/165; Y10T; Y10T428/00; Y10T428/23; Y10T428/239
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
43 words
An optical recording medium characterized in that an underlayer and a heat-sensitive color-developing layer are laminated in this order onto a base material, said underlayer containing a near infrared absorbent, said heat-sensitive color-developing layer containing a basic colorless dye and an organic developer.
Claim 2
Dependent Claim
43 words
An optical recording medium characterized in that an underlayer and a heat-sensitive color-developing layer are laminated in this order onto a base material, said underlayer containing a near infrared absorbent, said heat-sensitive color-developing layer containing a basic colorless dye and an organic developer.
Claim 3
Dependent Claim
36 words
An optical recording medium according to claim 1 wherein said near infrared absorbent is a dispersible near infrared absorbent which absorbs light having a wave length in a near infrared region of 0.7 to 2.5 μm.
Claim 4
Dependent Claim
25 words
An optical recording medium according to claim 2 wherein said dispersible near infrared absorbent is graphite, copper sulfide, lead sulfide, black titanium or tri-iron tetraoxide.
Claim 5
Dependent Claim
18 words
An optical recording medium according to claim 1 having a transparent protective layer on said heat-sensitive color-developing layer.
Claim 6
Dependent Claim
31 words
An optical recording medium according to claim 1 wherein a soluble near infrared absorbent is present in said underlayer or said transparent protective layer or is present on said protective layer.
Claim 7
Dependent Claim
18 words
An optical recording medium according to claim 1 wherein said underlayer in claim 1 contains a hollow pigment.
References Cited (Backward Citations)
EP0366461A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-23 | 1995-06-24 | 1995-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-23 | 1999-06-24 | 1999-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-23 | 2003-06-24 | 2003-12-24 | $7700.00 | Window Closed / Lapsed |