Patent US5342669A successfully refreshed from Google Patents.
US5342669A
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Optical information recording medium
Assignee: Kuraray Co Ltd
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Filing: 1992-03-27
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Granted: 1994-08-30
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Expires: 2012-03-27
Abstract
Abstract Optical information recording medium that has resistance to scratching, resistance to friction static electricity, rapid discharging, resistance to dust adhesion on surface, thus having high reliability. The optical information recording medium has one or more substrates and one or more recording layers, and, respectively, one or more hardening coats and one or more antistatic coats provided on one or two sides of the optical information recording medium.
Inventors
- 👤 Tadao Yoshikawa
- 👤 Kyoko Okamoto
- 👤 Tokuo Ikari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:01
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/03; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/253; G11B7/254; G11B7/257; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
46 words
An optical information recording medium having one or more sides, wherein one or more separate hardening coats and one or more separate antistatic coats are provided on at least one side of the optical information recording medium, said antistatic coats being located on the hardening coats.
Claim 2
Dependent Claim
46 words
An optical information recording medium having one or more sides, wherein one or more separate hardening coats and one or more separate antistatic coats are provided on at least one side of the optical information recording medium, said antistatic coats being located on the hardening coats.
Claim 3
Dependent Claim
22 words
An optical information recording medium as set forth in claim 1, wherein the hardening coat is an untra violet hardening resin coat.
Claim 4
Dependent Claim
42 words
An optical information recording medium as set forth in claim 1, wherein the hardening coat is an ultra violet hardening resin coat comprising multifunctional acrylate having three or more acryloyl groups in the molecule and mono-functional or di-functional (metha) acrylate or N-vinyllactam.
Claim 5
Dependent Claim
45 words
An optical information recording medium as set forth in claim 3, wherein the mole ratio of multifunctional (metha) acrylate having three or more acryloyl groups in the molecule and mono-functional or di-functional (metha) acrylate or N-vinyllactam lies between 1 to 2 and 2 to 1.
Claim 6
Dependent Claim
29 words
An optical information recording medium as set forth in any one of claims 1 to 4, wherein the coating thickness of the hardening coat is 1 to 30 μm.
Claim 7
Dependent Claim
28 words
An optical information recording medium as set forth in any one of claims 1 to 4, wherein the thickness of the antistatic coat is 0.01 to 1 μm.
Claim 8
Dependent Claim
25 words
An optical information recording medium as set forth in claim 1, wherein the antistatic coat is located on the outermost surface of the hardening coat.
Claim 9
Dependent Claim
69 words
An optical information recording medium as set forth in claim 1, wherein its surface hardness (pencil hardness) is not less than HB, and/or the degree of cloudiness after an abrasion test is not more than 20%, and/or full anti-scratch on steel-wool test, and the surface electrical resistance value is not more than 5×10 13 Ω/□, and/or the half-value period of charged antistatic electricity is not more than 20 seconds.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-08-29 | 1998-02-28 | 1998-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-29 | 2002-02-28 | 2002-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-29 | 2006-02-28 | 2006-08-30 | $7700.00 | Window Closed / Lapsed |