US4618537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording medium
Assignee: Canon Inc
•
Filing: 1984-01-24
•
Granted: 1986-10-21
•
Expires: 2004-01-24
Abstract
Abstract A recording medium comprising a substrate, a recording layer formed thereupon, and an anticorrosive layer which covers the recording layer and contains a chemical to prevent the corrosion of the recording layer.
Inventors
- 👤 Katsuhiko Takano
- 👤 Shigeharu Iijima
- 👤 Satoshi Yoshihara
- 👤 Masaaki Matsushima
- 👤 Hiroyoshi Kishi
- 👤 Eizo Sasamori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:21
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/72; G11B5/722; G11B13/00; G11B13/04; G11B13/045; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
55 words
A recording medium which comprises a substrate, a recording layer formed on the substrate, an anticorrosive adhesive layer formed on the recording layer and containing a chemical agent capable of preventing corrosion of the recording layer and inert to the recording layer, and a protective plate bonded to the recording layer through the anticorrosive layer.
Claim 2
Dependent Claim
55 words
A recording medium which comprises a substrate, a recording layer formed on the substrate, an anticorrosive adhesive layer formed on the recording layer and containing a chemical agent capable of preventing corrosion of the recording layer and inert to the recording layer, and a protective plate bonded to the recording layer through the anticorrosive layer.
Claim 3
Dependent Claim
15 words
The recording medium of claim 1, wherein the recording layer comprises a thin magnetic film.
Claim 4
Dependent Claim
29 words
The recording medium of claim 2, wherein the thin magnetic film comprises an amorphous material selected from the group consisting of GdTbFeCo, GdTbFe, GdCo, GdFe, TbFe, DyFe and TbDyFe.
Claim 5
Dependent Claim
15 words
The recording medium of claim 1, wherein the chemical agent is a rust preventive agent.
Claim 6
Dependent Claim
13 words
The recording medium of claim 1, wherein the protective plate consists of glass.
Claim 7
Dependent Claim
14 words
The recording medium of claim 4, wherein the rust preventive is a volatile one.
Claim 8
Dependent Claim
14 words
The recording medium of claim 4, wherein the rust preventive is an oil-soluble one.
Claim 9
Dependent Claim
29 words
The recording medium of claim 4, wherein the quantity added of the rust preventive is up to 10% by weight based on the total weight of the anticorrosive layer.
Claim 10
Dependent Claim
31 words
The recording medium of claim 4, wherein the quantity added of the rust preventive is in the range of 2.0-5.0% by weight based on the total weight of the anticorrosive layer.
Claim 11
Dependent Claim
20 words
The recording medium of claim 4, wherein the thickness of the anticorrosive layer is in the range of 30-200 μm.
Claim 12
Dependent Claim
20 words
The recording medium of claim 1, wherein a protective layer is formed between the recording layer and the anticorrosive layer.
Claim 13
Dependent Claim
13 words
The recording medium of claim 11, wherein the protective layer comprises a metal.
Claim 14
Dependent Claim
22 words
The recording medium of claim 12, wherein the metal is selected from the group consisting of Ti, Cr, Zn, Al and Si.
Claim 15
Dependent Claim
13 words
The recording medium of claim 11, wherein the protective layer comprises an oxide.
Claim 16
Dependent Claim
25 words
The recording medium of claim 14, wherein the oxide is selected from the group consisting of SiO, SiO 2 and Al 2 O 3 .
Claim 17
Dependent Claim
13 words
The recording medium of claim 1, wherein the substrate is a glass plate.
Claim 18
Dependent Claim
54 words
A recording medium which comprises two substrates, a recording layer formed on each of the substrates, and an anticorrosive adhesive layer containing a chemical agent capable of preventing corrosion of the recording layer and inert to the recording layer, said anticorrosive layer bonding said two substrates such that the recording layers face each other.
Claim 19
Dependent Claim
54 words
A recording medium which comprises two substrates, a recording layer formed on each of the substrates, and an anticorrosive adhesive layer containing a chemical agent capable of preventing corrosion of the recording layer and inert to the recording layer, said anticorrosive layer bonding said two substrates such that the recording layers face each other.
Claim 20
Dependent Claim
15 words
The recording medium of claim 17 wherein the recording layer comprises a thin magnetic film.
Claim 21
Dependent Claim
15 words
The recording medium of claim 17 wherein the chemical agent is a rust preventive agent.
Claim 22
Dependent Claim
21 words
The recording medium layer of claim 17 wherein a protective layer is formed between the recording layer and the anticorrosive layer.
Claim 23
Dependent Claim
13 words
The recording medium of claim 17 wherein the substrate is a glass plate.
References Cited (Backward Citations)
US3993824A
Cited
US4411963A
Cited
US4307156A
Cited
US4293621A
Cited
US4315057A
Cited
US4419404A
Cited
US4425404A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-20 | 1990-04-21 | 1990-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-20 | 1994-04-21 | 1994-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-20 | 1998-04-21 | 1998-10-21 | $7700.00 | Window Closed / Lapsed |