Patent US4944981A successfully refreshed from Google Patents.
US4944981A
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Optical recording medium
Assignee: Canon Inc
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Filing: 1989-04-11
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Granted: 1990-07-31
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Expires: 2009-04-11
Abstract
Abstract An optical recording medium comprises an organic film, wherein said organic film contains at least one compound selected from the compounds represented by Formulas (I), (II) and (III).
Inventors
- 👤 Yoshihiro Oguchi
- 👤 Tsuyoshi Santoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:40
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; G11B7/246; G11B7/247; G11B7/2472; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/26; Y10T428/261; Y10T428/31504; Y10T428/31507; Y10T428/31678
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
103 words
An optical recording medium comprising a substrate supporting an organic film, wherein said organic flim includes a polymethine compound represented by ##STR445## wherein A, B, D and E each represent a hydrogen atom, a substituted or unsubstituted alkyl group, a cyclic alkyl group, an alkenyl group, substituted or unsubstituted aryl group, a substituted or unsubstituted styryl group, a substituted unsubstituted heterocyclic group: R 1 , R 2 , R 3 , and R 4 each representing a hydrogen atom, a halogen atom, or an alkyl group; m and n each represents an integer of 1, 1 or 2; and Z - represents ##STR446##
Claim 2
Dependent Claim
103 words
An optical recording medium comprising a substrate supporting an organic film, wherein said organic flim includes a polymethine compound represented by ##STR445## wherein A, B, D and E each represent a hydrogen atom, a substituted or unsubstituted alkyl group, a cyclic alkyl group, an alkenyl group, substituted or unsubstituted aryl group, a substituted or unsubstituted styryl group, a substituted unsubstituted heterocyclic group: R 1 , R 2 , R 3 , and R 4 each representing a hydrogen atom, a halogen atom, or an alkyl group; m and n each represents an integer of 1, 1 or 2; and Z - represents ##STR446##
Claim 3
Dependent Claim
20 words
The optical recording medium of claim 1, wherein said organic film has a thickness of from 50Å to 100 μm.
Claim 4
Dependent Claim
29 words
The optical recording medium of claim 1, wherein said optical recording medium, performs recording by the formation of pits by virtue of changes in shape of the recording layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-30 | 1994-01-29 | 1994-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-30 | 1998-01-29 | 1998-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-30 | 2002-01-29 | 2002-07-31 | $7700.00 | Window Closed / Lapsed |