Patent US5141785A successfully refreshed from Google Patents.
US5141785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording medium
Assignee: Canon Inc
•
Filing: 1990-04-13
•
Granted: 1992-08-25
•
Expires: 2010-04-13
Abstract
Abstract The present invention relates to a recording medium comprising a plane substrate and a recording layer containing a polymer liquid crystal compound, wherein said recording layer containing a polymer liquid crystal compound has a groove.
Inventors
- 👤 Kazuo Yoshinada
- 👤 Toshikazu Ohnishi
- 👤 Yutaka Kurabayashi
- 👤 Tsuyoshi Santoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:50
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/002; G11B7/003; C; C09; C09K; C09K19/00; C09K19/04; C09K19/38; C09K19/3833; C09K19/3842; C09K19/3852; C09K19/52; C09K19/60; C09K19/601; C09K19/603; G11B7/0033; G11B7/24; G11B7/241; G11B7/242; G11B7/244; G11B7/245; G11B7/246; G11B7/248; G11B7/25; G11B7/26; G11B7/263; C09K2323/00; C09K2323/03; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
64 words
A recording medium, comprising: a plane substrate without grooves; and a plane recording layer containing a polymer liquid crystal compound, said plane recording layer having two opposing sides, wherein said recording layer is grooved on one opposing side and is not grooved on the other opposing side, said plane substrate being located other than adjacent said side of said recording layer bearing said grooves.
Claim 2
Dependent Claim
64 words
A recording medium, comprising: a plane substrate without grooves; and a plane recording layer containing a polymer liquid crystal compound, said plane recording layer having two opposing sides, wherein said recording layer is grooved on one opposing side and is not grooved on the other opposing side, said plane substrate being located other than adjacent said side of said recording layer bearing said grooves.
Claim 3
Dependent Claim
16 words
The recording medium according to claim 1, wherein said recording medium further comprises a reflective layer.
Claim 4
Dependent Claim
34 words
A recording medium, comprising: a plane substrate; a reflective layer; and a recording layer containing a polymer liquid crystal compound, wherein said recording layer has grooves formed at its interface with said reflective layer.
Claim 5
Dependent Claim
34 words
A recording medium, comprising: a plane substrate; a reflective layer; and a recording layer containing a polymer liquid crystal compound, wherein said recording layer has grooves formed at its interface with said reflective layer.
Claim 6
Dependent Claim
26 words
The recording medium according to claims 1 or 3, wherein said grooves in said recording layer have a depth of from 500 Å to 1 μm.
Claim 7
Dependent Claim
24 words
The recording medium according to claim 4, wherein said grooves in said recording layer have a depth of from 0.1 μm to 0.2 μm.
Claim 8
Dependent Claim
25 words
The recording medium according to claims 1 or 3 wherein said recording medium is in the form of a disk, a card or a tape.
Claim 9
Dependent Claim
30 words
The recording medium according to claims 1 or 3, wherein said recording layer is formed of a composition comprising a polymer liquid crystal compound and a low-molecular liquid crystal compound.
Claim 10
Dependent Claim
18 words
The recording medium according to claims 1 or 3, wherein said recording layer contains a laser absorbing compound.
References Cited (Backward Citations)
JPS5910930A
Cited
JPS5935989A
Cited
US4752820A
Cited
JPS62107448A
Cited
US4734359A
Cited
US4777492A
Cited
JPS62154340A
Cited
EP0235748A2
Cited
US4946261A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-25 | 1996-02-24 | 1996-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-25 | 2000-02-24 | 2000-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-25 | 2004-02-24 | 2004-08-25 | $7700.00 | Window Closed / Lapsed |