Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Utilizing plasma – electric – electromagnetic – particulate – or...
Patent
1991-08-19
1992-10-27
Lowe, James
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Utilizing plasma, electric, electromagnetic, particulate, or...
264 17, 264 23, 264 26, 264 27, 264 22, 425808, B29D 1100
Patent
active
051587181
ABSTRACT:
Hydrophobic casting moulds are treated with electrical discharge, such as corona discharge, to provide enhanced compatibility with hydrophilic objects introduced into the mould, without interfering with the release properties of the mould. A preferred embodiment involves treatment of contact lens casting moulds with corona discharge to provide improvements in the lens manufacturing procedure, as well as enhancement in the quality of the contact lenses themselves. The invention is particularly applicable to the production of contact lenses having a colored iris pattern imprinted thereon.
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Evans John M.
Phoenix John T.
Skipper Richard S.
Stafford Peter H.
Thakrar Ashok
Barber Frank T.
Cates Charles E.
Lowe James
Pilkington Visioncare Inc.
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