ALLEN L COHEN
Optometry in Richmond, VA

6025830, Feb 15, 2000

Oct 5, 1997

8/844621

Allen L. Cohen - Richmond VA

G09G 500

345156

A computer input device or wand that may be held and controlled by an infant, a toddler, or an adult who cannot use a conventional input device. An elongated handle is provided for gripping and manipulating the input device. The handle may conform to the size of a baby's hand to allow the input device to be securely held by a baby. The input device or wand includes an omnidirectionally responsive transducer for actuating an electrical control signal in response to each unidirectional sweep of the wand in a plane perpendicular to the axis of the handle, thereby allowing the user to control a computer display by shaking the wand in the same manner as a baby might shake a rattle.

5751273, May 12, 1998

Apr 30, 1996

8/640330

Allen L. Cohen - Richmond VA

G09G 500, A63F 924

345156

A computer input device or wand that may be held and controlled by an infant, a toddler, or an adult who cannot use a conventional input device. An elongated handle is provided for gripping and manipulating the input device. The handle may conform to the size of a baby's hand to allow the input device to be securely held by a baby. The input device or wand includes an omnidirectionally responsive transducer for actuating an electrical control signal in response to each unidirectional sweep of the wand in a plane perpendicular to the axis of the handle, thereby allowing the user to control a computer display by shaking the wand in the same manner as a baby might shake a rattle.

5054905, Oct 8, 1991

Nov 20, 1989

7/438320

Allen L. Cohen - Richmond VA

G02C 704, G02B 2744, G02B 518, A61F 216

351161

An ophthalmic lens including a carrier lens having an anterior and a posterior surface. A zone plate is having a plurality of zones is disposed annularly about the optical axis of the carrier lens on at least one of the anterior or posterior sides. Each of the zones of the zone plate is spaced from the optical axis in proportion to the square root of n, where n is the zone number. At least one echelette is disposed in each of the zones, each of the echelettes having a surface through which light propagating along the optical axis traverses. The surface of the echelettes varies in a predetermined manner from the zone nearest the optical axis to the zone furthest from the optical axis so that as the size of the aperture disposed along the optical axis changes, the relative intensity of light diffracted to desired orders changes. A step is provided between each of the echelettes, the height of each step having substantially the same optical path length.

4881804, Nov 21, 1989

Nov 12, 1987

7/120265

Allen L. Cohen - Richmond VA

G02C 704, G02B 518, G02B 2744

351161

An ophthalmic contact lens with a phase plate and a pure refractive portion within its optic zone. The invention embraces an ophthalmic contact lens of the Cohen lens design with a phase plate and a pure refractive portion within its optic zone.

4210391, Jul 1, 1980

Dec 18, 1978

5/970751

Allen L. Cohen - Richmond VA

G02B 308, G02B 518, G02C 704

351161

A multifocal Fresnel lens construction suitable for use in optical systems with multifocal requirements. It is designed as a multifocal zone plate to allow an annular ring construction that isn't width limited by diffraction aberrations. This is accomplished by modifying the phase separating annular rings of a zone plate, with curved or inclined optical facets of varying refractive indices, which can then function as Fresnel rings corresponding to the different focal powers desired.

4995715, Feb 26, 1991

Dec 22, 1989

7/456230

Allen L. Cohen - Richmond VA

G02C 704, G02B 2744, G02B 308, A61F 216

351161

A diffractive multifocal optical element comprising a phase zone plate containing annular concentric zones in which the zones are spaced substantially proportional to. sqroot. n, the zones possess stepped facets that introduce a discontinuity in optical path length of less than. lambda. /2.

5056908, Oct 15, 1991

Nov 20, 1989

7/438321

Allen L. Cohen - Richmond VA

G02C 704, G02B 518, G02B 2744, A61F 216

351161

An ophthalmic contact lens with a phase plate and a pure refractive portion within its optic zone. The invention embraces an ophthalmic contact lens of the Cohen lens design with a phase plate and a pure refractive portion within its optic zone.

5121979, Jun 16, 1992

Dec 22, 1989

7/456226

Allen L. Cohen - Richmond VA

G02B 2744, G02B 308, G02B 310, G02C 706

351161

A bifocal lens of the Cohen lens design utilizing phase zone plate optics and a facet depth of one-half wavelength of the design wavelength, where the primary focal points are at two orders, specifically the 0. sup. th and 1. sup. st orders, and the brightness at each primary focal point is equal at about 0. 40.

4338005, Jul 6, 1982

Apr 21, 1980

6/142005

Allen L. Cohen - Richmond VA

G02B 308, G02B 1700, G02C 704, G02C 706

351161

A phase plate construction suitable for use in optical systems with multifocal requirements. It is designed as a phase plate in order to provide sharp and clear focii with bright images. This is accomplished by adjusting the Fresnel echelettes and the zone plate spacings, of the phase plate, such that the Fresnel lens focii coincide with particular zone plate focii.

5121980, Jun 16, 1992

Apr 19, 1989

7/340496

Allen L. Cohen - Richmond VA

G02C 704, G02B 2744, A61F 216

351161

An optical device suitably employable in intraocular and contact lenses that employs a phase zone plate of a Cohen lens design that relies on a small number of zones to provide multifocal images.