Patents by Inventor Praful C. Doshi

Praful C. Doshi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Methods for fabricating annular mask lens having diffraction-reducing edges
    Patent number: 5965330
    Abstract: Methods for fabricating annular mask lens for vision correction having diffraction-reducing edges are provided. The lens body having an annular mask that forms a "soft edge" by gradually decreasing the transmissivity radially from the center aperture to the annular mask area. The methods introduce varying levels of a coloring agent (e.g., dye) into certain portions of the lens.
    Type: Grant
    Filed: December 6, 1996
    Date of Patent: October 12, 1999
    Assignee: PBH, Inc.
    Inventors: John M. Evans, Chun-Shen Lee, Praful C. Doshi, Jerome A. Legerton
  • Annular mask lens having diffraction reducing edges
    Patent number: 5905561
    Abstract: Annular mask lens for vision correction having diffraction-reducing edges. The lens body having an annular mask that forms a "soft edge" by gradually decreasing the transmissivity radially from the center aperture to the annular mask area.
    Type: Grant
    Filed: June 14, 1996
    Date of Patent: May 18, 1999
    Assignee: PBH, Inc.
    Inventors: Chun-Shen Lee, Jerome A. Legerton, John M. Evans, Praful C. Doshi
  • Variable transmissivity annular mask lens for the treatment of optical aberrations
    Patent number: 5662706
    Abstract: An annular mask lens for the treatment of optical aberrations such as but not limited to night myopia, spherical aberration, aniridia, keratoconus, corneal scarring, penetrating keratoplasty, and post refractive surgery complication. The lens has an annular mask having an aperture larger than conventional pinhole contact lens. The aperture having a "soft" inside edge and which mask has a gradually increasing transmissivity radially toward the outer edge of the mask.
    Type: Grant
    Filed: June 14, 1996
    Date of Patent: September 2, 1997
    Assignee: PBH, Inc.
    Inventors: Jerome A. Legerton, Chun-Shen Lee, John M. Evans, Praful C. Doshi