Producing soft contact lenses
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United States of America Patent
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Aug 31, 1982
Issued Date -
N/A
app pub date -
Sep 25, 1980
filing date -
Sep 12, 1977
priority date (Note) -
Expired
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Abstract
A soft contact lens is provided by: pouring an excess amount of an original solution for producing a soft contact lens into a concave mold; placing a convex mold on said concave mold and overflowing the excess of said original solution to thereby uniformly fill said original solution in a space between said concave mold and said convex mold; gelling said original solution between the two molds to form therebetween a lens having a tensile strength of at least about 0.1 kgf/cm.sup.2 ; immersing said lens and said two molds in a liquid to peel said lens from said molds; and extracting the thus-peeled lens via an extraction treatment with water. The 'original solution' contains: a component A selected from the group consisting of monomers and hydrophillic polymers wherein the monomers yield hydrophillic component when polymerized; a compound B selected from the group consisting of monomers and hydrophobic polymers wherein the monomers yield hydrophobic component when polymerized; and a solvent C the weight ratio of A:B being from about 85:15 to about 55:45 and solvent C being about 5 to 95% by weight.
First Claim
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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- TORAY INDUSTRIES, INC.
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Kenjo, Hideki | Otsu, JP | 4 | 152 |
Ohkada, Shinzo | Kyoto, JP | 1 | 109 |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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