US5009987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical recording medium containing IR-ray absorptive compound
Assignee: Canon Inc
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Filing: 1989-11-14
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Granted: 1991-04-23
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Expires: 2009-11-14
Abstract
Abstract The present invention relates to an optical recording medium comprising at least one of the following IR-ray absorptive compounds: ##STR1## Incorporation of the IR-ray absorptive compound of the present invention into an optical recording medium noticeably improves the durability of the medium measured by repeated reproduction and light resistance.
Inventors
- 👤 Chieko Mihara
- 👤 Tsuyoshi Santoh
- 👤 Hiroyuki Sugata
- 👤 Tetsuro Fukui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:51
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/72; C07D213/73; G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; G11B7/252; G11B7/257; Y; Y10; Y10S; Y10S430/00; Y10S430/145; Y10S430/146; Y10S430/165
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
114 words
An optical recording medium, comprising a recording layer containing at least one IR-ray absorptive compounds represented by formulae (I) or (II): ##STR18## where Y 1 , Y 2 , Y 3 , Y 4 , Y 5 , and Y 6 form a substituted or unsubstituted heterocycle which has at least one nitrogen atom; R 1 to R 8 are hydrogen, halogen, or a univalent organic radical, or at least one of the combinations of the atomic groups of R 1 and R 2 , R 3 and R 4 , R 5 and R 6 , and R 7 and R 8 are the same or different; and X - is an anion.
Claim 2
Dependent Claim
114 words
An optical recording medium, comprising a recording layer containing at least one IR-ray absorptive compounds represented by formulae (I) or (II): ##STR18## where Y 1 , Y 2 , Y 3 , Y 4 , Y 5 , and Y 6 form a substituted or unsubstituted heterocycle which has at least one nitrogen atom; R 1 to R 8 are hydrogen, halogen, or a univalent organic radical, or at least one of the combinations of the atomic groups of R 1 and R 2 , R 3 and R 4 , R 5 and R 6 , and R 7 and R 8 are the same or different; and X - is an anion.
Claim 3
Dependent Claim
36 words
An optical recording medium according to claim 1, wherein compound of formula (I) or (II) is contained in an amount of from 1 to 60% by weight based on the total solids in said recording layer.
Claim 4
Dependent Claim
37 words
An optical recording medium according to claim 2, wherein the compound of formula (I) or (II) is contained in an amount of from 5 to 40% by weight based on the total solids in said recording layer.
Claim 5
Dependent Claim
37 words
An optical recording medium according to claim 3, wherein the compound of formula (I) or (II) is contained in an amount of from 10 to 30% by weight based on the total solids in said recording layer.
Claim 6
Dependent Claim
17 words
An optical recording medium according to claim 1, further comprising a protective layer on said recording layer.
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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) | 1994-04-22 | 1994-10-22 | 1995-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-22 | 1998-10-22 | 1999-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-22 | 2002-10-22 | 2003-04-23 | $7700.00 | Window Closed / Lapsed |