Matches 351 - 400 out of 461 < 1 2 3 4 5 6 7 8 9 10 >
Match Document Document Title
4619793 Method of producing annealed polyvinyl alcohol contact lens  
Optically clear soft contact lenses of aqueous swollen solid polyvinyl alcohol having a weight average molecular weight of at least 6,000, having been annealed under crystallinity promoting...
4582655 Production of optical element with a varying refractive index  
An optical element, consisting essentially of an amorphous compound and having a varying refractive index, is prepared by introducing a melt of the material into a mold and cooling it in such a...
4576850 Shaped plastic articles having replicated microstructure surfaces  
An article comprising a shaped, plastic layer or body comprising crosslinked polymer with hard and soft segments or moieties and having a microstructure-bearing surface is prepared by a process...
4576766 Photochromic compounds and their use in photoreactive lenses  
A method is disclosed for manufacturing transparent plastic articles, primarily plano or opthalmic photoreactive lenses, which comprises incorporating fulgides or fulgimides containing an...
4560342 Injection molding instrument for forming resin concave lenses  
Apparatus for forming a concave lens of resin material and adapted to be used, for example, in spectacles, video projection devices, etc., whereby raw material is fed into substantially the center...
4554115 Method of controlling the convex curve of soft lenses  
A method of controlling the peripheral flattening of the convex aspheric surface on soft contact lenses by providing a soft lens having a spherical convex surface and aspheric concave surface. The...
4541855 Method of forming a glass or ceramic product  
A method of forming a glass or ceramic product by the direct casting of a non-aqueous suspension of a particulate oxide such as fumed SiO 2 or Al 2 O 3 into a final product configuration,...
4540532 Method and apparatus for molding ophthalmic lenses  
Finished and semi-finished ophthalmic lenses are made by polymerizing the monomer while it is sealed in an oxygen-impermeable envelope.
4537732 System and process for producing molded optical elements  
A system in process for producing an improved plastic molded optical element such as a mirror or lens is provided. The molded optical body has at least a surface portion designed for effective...
4534929 Matrix and method of using an aliphatic alcohol coated silica glass matrix  
A matrix having a surface of silica glass which is suitable for the manufacture of articles of synthetic resin in which the surface of the matrix comprises a monolayer of an aliphatic alcohol, as...
4534916 Method for the preparation of hydrophilic gels by monomer casting  
Hydrogels, e.g. hydrogel contact lens are prepared by casting, preferably spin casting, hydrophilic gels in a plastic mold, preferably polypropylene in the presence of a surface active agent.
4532267 Vision correction lens made from an aminopolysaccharide compound or an ether or ester thereof  
An oxygen permeable, wettable, optically acceptable vision correction lens can be made from homopolymers of aminoglycans, substituted aminoglycans, or crosslinked polymers thereof.
4521351 Process for producing light-transmitting element of synthetic resin  
A process for producing a light-transmitting element of a synthetic resin, which comprises (1) preparing a mixture composed of at least three monomers, said monomers having a difference in the...
4517140 Device and method for centrifugally casting articles  
A device and method for spin casting articles, such as lenses, employing a rotatable polymerization column in conjunction with a plurality of molds such that the column is adapted to accommodate a...
4516924 Retaining means for device for centrifugally casting symmetrical or asymmetrical articles  
A device for the centrifugal casting of articles in a rotatable polymerization column which includes retaining means disposed in the lower end of the column for communicating with a mold therein...
4514357 Production of molded articles having excellent optical characteristics  
A molded article having excellent optical characteristics and obtained by injection molding a resin composition of a bis(hydroxyphenyl)alkane polycarbonate resin having an average molecular weight...
4495015 Controlled wafer relaxing in making composite lenses  
Disclosed, in a method for preparing a preformed thermoplastic/thermoset wafer for lamination to a prefinished ophthalmic lens, the improvement comprising: storing the preformed...
4489110 Polyethylene terephthalate moulding compositions having high reflectivity  
Polyethylene terephthalate moulding compositions which contain delaminated kaolin may be processed into highly-reflecting objects.
4472327 Method of making hydrogel cosmetic contact lenses  
A method of making cosmetic hydrogel contact lenses which alter the apparent color of the iris by employing small light reflecting particles imbedded in a colored transparent matrix. Cosmetic...
4469646 Method of molding plastic contact lenses  
Plastic contact lenses are formed in a casting process in which the required amount of lens-forming material is charged into a mold half, the mating lens half is inserted but only far enough to...
4460523 Method of making cosmetic contact lenses  
A method of making cosmetic contact lenses which alter the apparent color of the iris by employing small light reflecting particles imbedded in a colored transparent matrix. Cosmetic contact lenses...
4459246 Molding contact lenses using a directed stream of gas  
The lens is molded in a concave lens mold, the liquid lens monomer is placed in the concave mold and a controlled stream of gas is directed at the center of the liquid surface and shapes the...
4456344 Fresnel lens, and a method and mold for manufacturing it  
The Fresnel lens is provided, as viewed in cross-section, with a face formed with a plurality of spirally arranged teeth, each whereof includes a light ray refracting portion and a connection flank...
4451629 Contact lens and process for preparing the same  
A water-absorptive contact lens made of a copolymer comprising units of an ester of acrylic or methacrylic acid and at least one saccharide selected from D-galactose, D-glucose and D-mannose and...
4441795 Molded multifocal lens and mold assembly  
A lens having a set of physical features provided on the edge thereof for permitting a set of reference marks to be placed on the lens surface together with an apparatus for applying these physical...
4439259 Method of making laser fusion debris shield  
A shield for admitting laser beams to a target in a reaction chamber while obstructing exit of target ejected debris from the chamber is formed by coating the opposable faces of two supports with a...
4426505 Polymers containing decahalopentacyclodecyl groups  
New polymers are disclosed comprising recurring units of the formula ##STR1## wherein R is hydrogen or lower alkyl containing from 1 to 5 carbon atoms, L is a divalent linking group, and each X is...
4419463 Preparation of cross-linked hydrogel copolymers for contact lenses  
The invention relates to soft contact lenses having a water content of at least about 45% and comprising a hydrated copolymer of a major proportion of an hydroxyalkyl acrylate or methacrylate, up...
4419505 Contact lens composition, article and method of manufacture  
A copolymer composition, specially adapted for use in fabricating a contact lens comprises a copolymer of comonomers which include about 1-95 parts by weight of hydroxy silane esters of acrylic or...
4416814 Protein polymer hydrogels  
Protein hydrogel structures formed from natural proteins having an average molecular weight of about 100,000 or less by dissolving the protein in an aqueous acidic solution, subjecting the protein...
4409277 Visual information carrier comprising a flexible plastic sheet  
A visual information carrier comprising a single layer sheet of transparent synthetic polymer having dispersed therein a fluorescent dye. The sheet is not subject to white fracture and has...
RE31406 Oxygen permeable contact lens composition, methods and article of manufacture  
Contact lenses are fabricated from a copolymer of a polysiloxanylalkyl acrylic ester and an alkyl acrylic ester. The copolymer has increased oxygen permeability.
4400333 Production of oxygen permeable contact lenses  
This invention relates to a method for correcting visual refractive errors of the human eye. In this method, a contact lens is fitted to the patient's eye, the lens being oxygen permeable,...
4393184 Lens having a high refractive index with a low dispersion  
A lens having a high refractive index with a low dispersion produced by copolymerizing a polyfunctional allyl monomer with at least one monomer selected from the group represented by the general...
4390676 Ultraviolet absorbing lenses  
An ultraviolet absorbing lens for use by aphakics formed by copolymerizing a monomer suitable for making lenses and a copolymerizable ultraviolet absorber for absorbing radiation having wavelength...
4386039 Process for forming an optically clear polyurethane lens or cornea  
Process for forming optically clear lenses or artifical corneas from a reaction product of 4,4' dicyclohexylmethane diisocyanate, polytetramethylene ether glycol and ethylene oxide-capped...
4376800 Optical lenses prepared from crosslinkable acrylic compositions  
An optical lens having an absorbance of less than about 0.1 for visible radiation of a wavelength in the range of from about 400 to about 600 nanometers is prepared from a crosslinkable acrylic...
4373065 Optically isotropic devices  
An optically isotropic device or component made of an optically isotropic polymeric material which is a blend of two completely miscible polymers which have opposite optical anisotropies. The blend...
4367014 Polygonal rotary scanners  
A polygonally shaped, multifaceted rotary scanner comprising a plurality of optically flat, reflective surfaces on the facets. The reflective surfaces are integrally bonded to a multifaceted,...
4366141 Treatment of coarse particle size zinc sulfide to improve visual and infrared transmission on hot-pressed articles  
Coarse particle size zinc sulfide is treated with a solution of alkali metal halide to make it adaptable for hot-pressing into shaped, polycrystalline windows which is more transparent in the...
4347198 Producing soft contact lenses  
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...
4343927 Hydrophilic, soft and oxygen permeable copolymer compositions  
A new composition of matter specially adapted for the production of contact lenses, artificial eyes or other prosthetic devices. The composition has the characteristics of increased hydrophilicity,...
4327149 Extruded rigid thermoplastic sheet having optically smooth surfaces  
An extruded rigid thermoplastic sheet having optically smooth surfaces, characterized as exhibiting a degree of optical distortion (δ) of from 0.03 to 0.06, is produced by a process wherein a...
4322139 Hydrophilic-gel contact lenses adapted into a planarized xerogel state and method for making the same  
The invention pertains to a method of temporary planarization of hydrogel contact lenses by drying of a lens swollen in a volatile hydrophilic swelling agent and clamped in the planarized state...
4304895 Ultraviolet absorbing corneal contact lenses  
This invention relates to ultraviolet absorbing lenses, particularly corneal contact lenses, comprising a polymeric shaped body having an ultraviolet absorber dispersed substantially uniformly...
4303635 Zinc sulfide body for optical purposes  
Optical-grade zinc sulfide bodies produced by the CVD technique and subjected to an aftertreatment under a high gas pressure and at elevated temperature possess improved optical properties. They...
4300821 Photochromic ophthalmic lens of organic materials  
An ophthalmic lens made of organic material has at least one layer of photochromic mineral glass within its mass to impart photochromic properties to the lens. This layer has a fibrous structure...
4299441 Transparent laboratory slide for examination of liquid specimens  
An improved transparent slide, and method of manufacture, the slide having a plurality of covered chambers defined between generally parallel and uniformly spaced sidewalls integral to the slide...
4287227 Coating composition and process for producing synthetic resin moldings by using the same  
A coating composition comprising a monomer mixture of mono- or polypentaerythritol hving at least three (meth) acryloyloxy groups and at least one monofunctional acrylate or methacrylate having at...
4285890 Method for manufacturing silicone contact lenses  
A method for manufacturing silicone lenses by use of a mold of specific structure is provided. The mold comprises a male section and a female section each of which has a mold surface plated with...
Matches 351 - 400 out of 461 < 1 2 3 4 5 6 7 8 9 10 >