US5382448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing optical transmission medium from synthetic resin
Assignee: Eneos Corp
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Filing: 1994-03-21
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Granted: 1995-01-17
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Expires: 2014-03-21
Abstract
Abstract A method of manufacturing a multimode optical transmission medium from a synthetic resin having the distribution of refractive index varying continuously in a fixed direction. In the method, a monomer is polymerized while a transparent polymer for constituting the wall of a vessel is being dissolved into the monomer. Therefore, this method is free from the defect of methods using conventional polymerization reactions, and has an extremely high productivity.
Inventors
- 👤 Yasuhiro Koike
- 👤 Eisuke Nihei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:07
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/02; G02B6/02033; G02B6/02038; G02B1/00; G02B1/04; G02B1/045; G02B1/046; G02B3/00; G02B3/0087; G02B6/10; G02B6/12; G02B6/13; G02B6/138
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
161 words
A method of manufacturing a multimode optical transmission medium formed from a synthetic resin having a distribution of refractive index varying continuously in a fixed direction comprising feeding a monomeric liquid selected from the group consisting of a monofunctional monomer and a mixture of two or more monofunctional monomers into a vessel formed of a transparent thermoplastic polymer, said monomeric liquid characterized by it being homopolymerizable into a polymer having a refractive index which differs from said transparent thermoplastic polymer by at least 0.005 and by its ability to dissolve said transparent thermoplastic polymer; radically polymerizing said monomeric liquid whereby a gel layer is formed adjacent to the inside wall of said vessel; and continuing said polymerization such that said gel layer is shifted from said inside wall of said vessel to the inner portion of said vessel whereby the concentration of said transparent thermoplastic polymer component in the synthetic resin is lowered in the direction of movement of the gel.
Claim 2
Independent Claim
161 words
A method of manufacturing a multimode optical transmission medium formed from a synthetic resin having a distribution of refractive index varying continuously in a fixed direction comprising feeding a monomeric liquid selected from the group consisting of a monofunctional monomer and a mixture of two or more monofunctional monomers into a vessel formed of a transparent thermoplastic polymer, said monomeric liquid characterized by it being homopolymerizable into a polymer having a refractive index which differs from said transparent thermoplastic polymer by at least 0.005 and by its ability to dissolve said transparent thermoplastic polymer; radically polymerizing said monomeric liquid whereby a gel layer is formed adjacent to the inside wall of said vessel; and continuing said polymerization such that said gel layer is shifted from said inside wall of said vessel to the inner portion of said vessel whereby the concentration of said transparent thermoplastic polymer component in the synthetic resin is lowered in the direction of movement of the gel.
Claim 3
Dependent Claim
25 words
The method as claimed in claim 1, wherein the polymer made from said monomer liquid is miscible with said transparent polymer constituting said vessel wall.
Claim 4
Dependent Claim
35 words
The method as claimed in claim 1 wherein said monomer has a solubility parameter δ M and said transparent polymer has a solubility parameter δ P which satisfies the following relationship, |δ.sub.M -δ.sub.P |<5 (cal/cm.sup.3).sup.1/2
Claim 5
Dependent Claim
35 words
The method as claimed in claim 1, wherein said monomeric liquid is methylmethacrylate and said transparent polymer constituting the vessel wall is a copolymer of methylmethacrylate with benzylmethacrylate or a copolymer of methyl-methacrylate with 1,1,2-trifluoroethylmethacrylate.
References Cited (Backward Citations)
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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) | 1998-01-16 | 1998-07-18 | 1999-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-16 | 2002-07-18 | 2003-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-16 | 2006-07-18 | 2007-01-17 | $7700.00 | Window Closed / Lapsed |