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US 3220960

How Soft Contact Lenses Were Invented Using Hydrogels

This patent describes the chemical recipe for soft, water-absorbing plastic materials that form the basis of modern soft contact lenses.

Statusexpired

Granted1965

Expires1980

Claims2

Forward citations228

Prior art4

AssigneeIndividual

InventorsWichterle Otto, Lim Drahoslav

Patent B

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