William Carl Hoffman
Pharmacy at Telluride Cir, Denver, CO

5846457, Dec 8, 1998

Mar 31, 1997

8/828657

William C. Hoffman - Lakewood CO

B29D 1100

264 21

The invention relates to a light-absorbing contact lens and process for preparing same. A contact lens is tinted with colorants which provide desired spectral transmittance characteristics over the tinted portion of the lens. The contact lens provides transmittance of incident radiation having a wavelength from 500 to 700 nm which is variable and wavelength-dependent. The lens of this invention also preferably filters out ultraviolet and blue light (wavelengths from 200 to about 500 nm). Various transmittance patterns for wavelengths from 500 to 700 nm are obtainable by appropriate choice of colorant combinations; the transmittance curve in this region and the colorants to achieve the desired transmittance characteristics are chosen to fill particular needs of a wearer as for example limiting transmittance of visible light in high intensity light environments. Lenses according to the invention may provide unique benefits for use with particular applications such as sporting activities, recreational activities, or the like. Both hard and soft contact lenses are disclosed, and various examples of specialized lenses for particular applications are disclosed.

5617154, Apr 1, 1997

Oct 28, 1994

8/331328

William C. Hoffman - Lakewood CO

Flexlens - Englewood CO

G02C 704

351162

The invention relates to a light-absorbing contact lens and process for preparing same. A contact lens is tinted with colorants which provide desired spectral transmittance characteristics over the tinted portion of the lens. The contact lens provides transmittance of incident radiation having a wavelength from 500 to 700 nm which is variable and wavelength-dependent. The lens of this invention also preferably filters out ultraviolet and blue light (wavelengths from 200 to about 500 nm). Various transmittance patterns for wavelengths from 500 to 700 nm are obtainable by appropriate choice of colorant combinations; the transmittance curve in this region and the colorants to achieve the desired transmittance characteristics are chosen to fill particular needs of a wearer as for example limiting transmittance of visible light in high intensity light environments. Lenses according to the invention may provide unique benefits for use with particular applications such as sporting activities, recreational activities, or the like. Both hard and soft contact lenses are disclosed, and various examples of specialized lenses for particular applications are disclosed.

4733959, Mar 29, 1988

May 1, 1985

6/729457

Eric R. Claussen - Denver CO
William C. Hoffman - Denver CO
Lawrence A. Smith - Denver CO

Optatint, Inc. - Englewood CO

G02C 704, D06P 500

351177

An apparatus and method for tinting hydrophilic contact lenses wherein a base having at least one post whose remote end is shaped for receiving and positioning a hydrophilic contact lens, and at least one cap which when placed in communication with the post and the lens masks one or more predetermined areas of the lens, is assembled with a lens positioned on the end of a post which is then capped. The assembly is immersed in a dye bath and then removed therefrom when the lens has attained the desired color, after which the assembly is placed in a fixing solution such that the lens is tinted permanently and fluid transport and oxygen permeability are unaffected.

8153726, Apr 10, 2012

Sep 27, 2006

11/535619

William C. Hoffman - Lakewood CO, US

The Lagado Corporation - Englewood CO

C08G 63/48, C08F 8/00, C08F 30/08, C08F 38/00, C08F 12/02

525 63, 525100, 526279, 526285, 526346

Provided are rigid contact lenses having high oxygen permeability and methods to make the same. The rigid contact lenses comprise a polyacetylene. Also provided are methods of making rigid high oxygen permeability contact lenses.

2008013, Jun 12, 2008

Nov 2, 2007

11/934188

William C. HOFFMAN - Lakewood CO, US

G02C 7/10

351163, 351177

This invention relates to an optical device such as a soft or rigid contact lens, intra ocular lens (IOL), ocular insert, or spectacle lens that improves visual acuity by reducing chromatic aberration. Chromatic aberration is reduced by filtering or blocking ultraviolet and high energy blue/violet light below about 455 nm and red and infrared light above about 655 nm. This is accomplished by including in the polymer formulations blue/violet absorbing colorants and ultraviolet light absorbers to filter or block light below about 455 nm; and red absorbing colorants and infrared absorbers to filter or block light above about 655 nm. When these materials are used for wavefront designed lenses, vision better than 20/20 is attainable.