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...that when IBM conducted a market study of Chester Carlson's invention in 1959, the company concluded that it would take only 5000 units of his new product to saturate the market? IBM therefore declined to be part of the new product introduction. Too bad for IBM. Carlson's invention was the xerography process, and his new product was the beginning of the Xerox Corporation. It is estimated that every day, worldwide, 3,000,000,000 copies are made!!

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Class 351/54 - Invertible or reversible multifocal type


Subclass of Class 351 - Optics: eye examining, vision testing and correcting
Definition: Subject matter wherein spectacles with multifocal lenses
No. of patents: 20
Last issue date: 01/17/2012


NumberTitleIssue Date
8096652Headband eyeglasses
Mask headband eyeglasses include a mask body and a pair of eyeglass lenses contained in the mask body. The mask body has a substantial headband shape. The mask body includes a front portion and a pair of support arms. Strip headband eyeglasses include a strip of mat...
01/17/2012
8029131Invertible eyewear
The present invention discloses glasses comprising an invertible nose bridge and invertible temples. The glasses can be worn in two manners by rotating the glasses 180 degrees in the plane of the lens or lenses. The lenses are asymmetrical along an axis which is dra...
10/04/2011
7762661Glasses with two position lenses
Glasses such as bifocals, which have refractive lenses which are rotatable at least between two positions. A manual control rotates the lenses such that if bifocal, the relatively small, high magnification zone of each lens can be moved to a high position opposed to...
07/27/2010
7325922Adjustable focus eyeglasses
Adjustable focus eyeglasses with two lens units, each lens unit having two lens elements. The eyeglasses are focused by adjusting the position of at least one of the two lens elements relative to the other in a direction generally perpendicular to a viewing directio...
02/05/2008
7222957Eyeglasses assembly
An eyeglasses assembly includes a pair of bifocals. Each of the bifocals includes a regular lens portion and a magnifying lens portion. A bridge is attached to the bifocals. The bifocals lie in a same plane as each other and the magnifying lens portions is aligned w...
05/29/2007
7198365Spectacle accessory
A spectacle accessory (100, 200, 300, 400, 500) is disclosed as including a pair of lenses (102, 202, 302, 402, 502), a pair of legs (110, 210, 310, 410, 510) engaged with the pair of lenses (102, 202, 302, 402, 502) and swivellably movab...
04/03/2007
7175274Combination sunglasses and reading eyeglasses
An eyeglasses assembly includes an eyeglass frame, a temple member, a first lens and a second lens. The first lens is connected to the frame and is positioned to allow a wearer of the frame to look through the first lens. The second lens is moveably connected to the...
02/13/2007
7118219Test tool for optometry
An test tool for optometry includes a lens holding frame and a clip. The lens holding frame pivotally supports a trial lens to be mounted. The clip is attached to a rear side of the lens holding frame to clamp glasses. The lens holding frame has a pair of axi-symmet...
10/10/2006
7083277Pair of spectacle lenses
A pair of spectacle lenses in which one spectacle lens is designed for distance vision or near vision, and the second spectacle lens is designed for another object distance. ...
08/01/2006
7059718Eyewear having a magnified wide field of view
The present invention generally encompasses eyewear having a clear, magnified, wide field of view. The eyewear comprises dual lens elements that have steeply curved front surfaces and that are specifically oriented about the head of the wearer. The lens elements hav...
06/13/2006
6979083Eyeglass lens with multiple optical zones having varying optical properties for enhanced visualization of different scenes in outdoor recreational activities
A lens for eyeglasses is provided with two or more optical zones on the lens body having different optical properties that enhance visualization of different scenes, including target objects within the scenes, that are associated with a specific recreational activit...
12/27/2005
6709099Method of assembling an interchangeable lens eyeglass system with bifocal segment
A method for assembling eyeglasses is disclosed. The method consists of selecting a pair of lenses from an inventory of circular lenses according to a patient's prescription. The circular lenses have the same geometric and optical center so they do not require groun...
03/23/2004
5792537Method and apparatus for masking removable optical lens markings during lens grinding
A method and apparatus for protecting removable markings on an optical lens during grinding thereof to a desired prescription. A mask is placed over the markings prior to application of an adhesive tape, to which a low temperature alloy block is bonded fo...
08/11/1998
5790227Highest-ophthalmic-quality hand-assembled instant multi-focal prescription eyeglasses custom adjusted to wearer astigmatism, pupillary distance and/or segment height
Multi-focal prescription composite lenses having at least two corrections are made by adhering a first-part lens having a predetermined positive or negative diopter correction realized by a cylinder correction prescription on a rear surface and a preselec...
08/04/1998
5790226Golf bifocals
The present invention includes a pair of glasses to be worn by a golfer where only one of the lenses contains a reconfigured bifocal lens, i.e. bifocal element. The placement of the bifocal element may be determined by the writing hand of the wearer or ma...
08/04/1998
5666180Liquid crystal display with reduced parasitic capacitance between pixel elements and matrix wiring elements
A liquid crystal display having a plurality of sets of matrix wiring elements, a plurality of active elements and a liquid crystal layer includes a conductive layer for being maintained at a predetermined potential, which layer is selectively provided aro...
09/09/1997
5598232Bifocal-compensating eyeglass attachment
An attachment for bifocal eyeglasses including at least one eyeglass lens having a first correcting region providing corrected distant-vision and a second correcting region providing corrected near-vision, the attachment including a compensating lens size...
01/28/1997
5499063Multifocal trial frame system
A multifocal trial frame system includes a trial frame shaped to engage the head of a wearer and which includes an adjustable nose bridge and a pair of downwardly-depending studs which are laterally adjustable relative to the nose bridge, a pair of lens b...
03/12/1996
5004334Auxiliary nosepiece for eyeglasses
An auxiliary nosepiece for eyeglasses is disclosed which is designed to be mountable on a pair of eyeglasses at the location of the existing nosepiece thereof. The auxiliary nosepiece of the present invention is designed to allow the user to wear a pair o...
04/02/1991
4863256Eyeglasses with invertable lens carriers
A pair of eyeglasses has a frame with hubs at each side of the frame, and a lens carrier rotatably mounted in the hubs to allow the lenses to be rotated slightly to adjust the pantoscopicity or to be rotated 180° to invert multifocal lenses. The lens car...
09/05/1989
 
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