Patents by Inventor Michael J. Tuhtan

Michael J. Tuhtan 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).

  • Process for molding thermoplastic lenses and, steeply curved and/or thin lenses produced thereby
    Patent number: 6440335
    Abstract: Disclosed are novel molding methods for injection molding thermoplastic lens elements and particularly adapted for the manufacture of steeply curved and/or thin-centered lenses.
    Type: Grant
    Filed: September 8, 2000
    Date of Patent: August 27, 2002
    Assignee: Sola International, Inc.
    Inventors: Jeffrey M. Kingsbury, Robert H. Juul, Michael J. Tuhtan, Martin D. Rolph, Michael A. Morris, Colin M. Perrott, Simon J. Edwards, Ray S. Spratt
  • Molding method for manufacturing thin thermoplastic lenses
    Patent number: 6284162
    Abstract: Disclosed are novel molding methods for manufacturing thin thermoplastic lenses and, in particular, minus ophthalmic lenses that have thickness of about 1 mm or less at the thinnest point thereof. The molding methods disclosed provide for lenses which lack any abrasion or polishing artifacts on the surface and also lack any negative fining marks below the nominal surface.
    Type: Grant
    Filed: March 25, 1999
    Date of Patent: September 4, 2001
    Assignee: Sola International, Inc.
    Inventors: Jeffrey M. Kingsbury, Michael J. Tuhtan, Robert H. Juul, Martin P. Rolph
  • Collapsible table with foldable leg braces held straight by cables when top is open
    Patent number: 4833998
    Abstract: A collapsible table, especially suited for supporting persons to be massaged, comprises, in a main embodiment, a pair of hingedly-connected top sections (12) and two pairs of legs (16) hingedly connected to the respective outer ends of the top sections. A foldable leg brace (18) is connected between the side of the table's top at its center and a lower part of each leg. A brace crosspiece (32) interconnects each pair of braces. A pair of short cable support legs (26) extend down from the center of the table. Each of a pair of cables (28) extends in a V-shaped arrangement from near the leg hinges at one end of the table down through holes in the brace crosspieces to the bottom ends of the cable support legs and then up through the other brace cross piece to the leg hinges at the opposite end of the table.
    Type: Grant
    Filed: February 9, 1988
    Date of Patent: May 30, 1989
    Inventors: James E. Everett, Michael J. Tuhtan
  • Gravity hinge
    Patent number: D799304
    Type: Grant
    Filed: May 26, 2016
    Date of Patent: October 10, 2017
    Inventors: Mark Fraas, Michael J. Tuhtan