Patent US4906556A successfully refreshed from Google Patents.
US4906556A
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Optical recording medium
Assignee: Fujifilm Holdings Corp
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Filing: 1989-07-10
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Granted: 1990-03-06
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Expires: 2009-07-10
Abstract
Abstract An optical recording medium comprising a substrate and a recording layer made of metal and/or semi-metal and on which data can be recorded with a laser beam, wherein a plasma polymerization layer is formed on at least an upper surface of said recording layer.
Inventors
- 👤 Yasuo Nishikawa
- 👤 Yonosuke Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:34
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/253; G11B7/242; G11B7/243; G11B7/257; G11B7/2572; G11B2007/24302; G11B2007/24306; G11B2007/24308; G11B2007/2431; G11B2007/24312; G11B2007/24314; G11B2007/24316; G11B2007/24318; G11B2007/2432; G11B2007/24322; G11B2007/24324; G11B2007/24326; G11B7/2531; Y; Y10; Y10S; Y10S430/00; Y10S430/146; Y10S430/162
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
141 words
An optical recording medium comprising a substrate and a recording layer made of one or more metals and/or semi-metals selected from the group consisting of Te, Sn, In, Au, Pt, Se, As, Bi, Al, Ga, Ge, Mo, Sb, Pb, Ti, laminates of said metals with semi-metals, mixtures of said metals with semi-metals, sulfides of said metals, oxides of said metals, metal fluorides, metal silicides, and metal nitrides and on which data can be recorded with a laser beam, wherein a plasma polymerization layer is formed on at least an upper surface of said recording layer and is formed by a monomer having the following formula: ##STR2## wherein A' is a hydrogen atom and B is any member selected from the group consisting of a hydrogen atom and one of an alkyl or an alkenyl group having one or more carbon atoms.
Claim 2
Dependent Claim
141 words
An optical recording medium comprising a substrate and a recording layer made of one or more metals and/or semi-metals selected from the group consisting of Te, Sn, In, Au, Pt, Se, As, Bi, Al, Ga, Ge, Mo, Sb, Pb, Ti, laminates of said metals with semi-metals, mixtures of said metals with semi-metals, sulfides of said metals, oxides of said metals, metal fluorides, metal silicides, and metal nitrides and on which data can be recorded with a laser beam, wherein a plasma polymerization layer is formed on at least an upper surface of said recording layer and is formed by a monomer having the following formula: ##STR2## wherein A' is a hydrogen atom and B is any member selected from the group consisting of a hydrogen atom and one of an alkyl or an alkenyl group having one or more carbon atoms.
Claim 3
Dependent Claim
61 words
An optical recording medium as claimed in claim 1, further comprising a second optical recording medium identical to the optical recording medium of claim 1 and bonded to the optical recording medium of claim 1 by means of an adhesive layer provided between the plasma polymerization layers formed on the upper surfaces of the recording layers of the two recording media.
Claim 4
Dependent Claim
25 words
An optical recording medium as claimed in claim 1, wherein the thickness of the plasma polymerization layer is about 50 Å to about 0.2 μm.
Claim 5
Dependent Claim
33 words
An optical recording medium as claimed in claim 1, wherein the plasma polymerization layer is formed from a compound that has a vapor pressure of or about 10 -4 Torr at 20° C.
References Cited (Backward Citations)
US4711809A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-05 | 1993-09-04 | 1994-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-05 | 1997-09-04 | 1998-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-05 | 2001-09-04 | 2002-03-06 | $7700.00 | Window Closed / Lapsed |