The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 20, 1978
Filed:
Aug. 18, 1975
Ceskoslovenska akademie ved, Prague, CS;
Abstract
The invention relates to a new type of soft contact lens from a hydrophilic, swelled copolymer, with high swelling capacity, high permeability for oxygen, comparatively high strength and low modulus of elasticity, said characteristics making the lens suitable for permanent wearing. The lens contains, at swelling equilibrium with water at 20.degree. C, from about 50 to about 95% by weight of water, preferably from about 70 to about 90%, and consists of a multiblock copolymer of acrylonitrile with acrylamide, containing, if desired, a minor amount of other monomer units, not exceeding 20 molar percent. The swelled hydrogel contains two distinct but inseparable phases, one of them being polyacrylonitrile detectable by X-ray analysis, the other being amorphous highly solvated hydrophilic polymer containing predominantly acrylamide units.