Patent US4845240A successfully refreshed from Google Patents.
US4845240A
Expired / Lapsed
US
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Optical recording medium and process for producing the same
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1988-03-28
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Granted: 1989-07-04
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Expires: 2008-03-28
Abstract
Abstract A long-chain keto group is introduced into the molecule of furylfulgide hng no hydrophobic group to procure a good balance of hydrophilicity and hydrophobicity, thereby making it possible to obtain a uniform ultra-thin film optical recording medium having photochromism of fulgide according to spin coating method of Langmuir-Blodgett method.
Inventors
- 👤 Junichi Hibino
- 👤 Eiji Ando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:32
CPC Classifications
C; C07; C07D; C07D493/00; C07D493/02; C07D493/04; G; G03; G03C; G03C1/00; G03C1/72; G03C1/73; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
22 words
A photochromic material represented by the following general formula: ##STR11## wherein R represents an alkyl chain having 5 to 31 carbon atoms.
Claim 2
Dependent Claim
22 words
A photochromic material represented by the following general formula: ##STR11## wherein R represents an alkyl chain having 5 to 31 carbon atoms.
Claim 3
Dependent Claim
19 words
A photochromic material according to claim 1, wherein R represents an alkyl chain having 13 to 23 carbon atoms.
Claim 4
Dependent Claim
16 words
A photochromic material according to claim 1, wherein R represents an alkyl chain having 17 carbon
Claim 5
Dependent Claim
47 words
A process for producing an amphiphatic photochromic compound, which comprises condensing a fulgide represented by the following formula: ##STR12## and a long-chain acid chloride having the formula: RCOCl (wherein R represents an alkyl chain having 5 to 31 carbon atoms) by subjecting them to a Friedel-Crafts reaction.
Claim 6
Dependent Claim
47 words
A process for producing an amphiphatic photochromic compound, which comprises condensing a fulgide represented by the following formula: ##STR12## and a long-chain acid chloride having the formula: RCOCl (wherein R represents an alkyl chain having 5 to 31 carbon atoms) by subjecting them to a Friedel-Crafts reaction.
References Cited (Backward Citations)
US4186002A
Cited
JPH02242677A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-03 | 1993-01-02 | 1993-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-03 | 1997-01-02 | 1997-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-03 | 2001-01-02 | 2001-07-04 | $7700.00 | Window Closed / Lapsed |