Patents Assigned to Dennis T. Grendahl
  • Patent number: 5509903
    Abstract: The disclosure relates to syringes which include a substantially rigid, hollow syringe body, a plunger and a flexible, finger-conformable grip, guard, collar or collet which are disposed about one end thereof.
    Type: Grant
    Filed: November 19, 1992
    Date of Patent: April 23, 1996
    Assignee: Dennis T. Grendahl
    Inventors: Dennis T. Grendahl, Fritz D. Harnsberger
  • Patent number: 4872878
    Abstract: The ultraviolet screening of a silicone rubber intraocular lens can be enhanced by the addition of an optical brightener. The optical brightener also serves to reduce any apparent yellow tint that may occur. The optical brightener is incorporated into the preformed silicone lens by immersing it in a solution containing the optical brightener and an ultraviolet screening agent.
    Type: Grant
    Filed: May 26, 1987
    Date of Patent: October 10, 1989
    Assignee: Dennis T. Grendahl
    Inventor: John S. Tiffany
  • Patent number: 4872877
    Abstract: An ultraviolet screening agent can be incorporated into a preformed silicone rubber intraocular lens by bringing it into contact with a solution which contains the agent in a higher concentration than the lens material.
    Type: Grant
    Filed: March 17, 1987
    Date of Patent: October 10, 1989
    Assignee: Dennis T. Grendahl
    Inventor: John Tiffany
  • Patent number: 4843209
    Abstract: Method and apparatus for manual or semiautomatic computer controlled laser staking of a haptic to an optic of an intraocular lens. An Nd:YAG laser with a HeNe laser aiming beam provides laser power to a fiber optic multiplexer to deliver laser energy to a plurality of staking work stations where the haptics are melted or fused to a lens optic. A fiber optic laser stylus is brought in close proximity with a haptic and optic for application of laser power to fuse or join the haptic to the optic in a cylindrically fused fashion, producing no surface wound and effectively sealing the haptic hole.
    Type: Grant
    Filed: November 5, 1987
    Date of Patent: June 27, 1989
    Assignee: Dennis T. Grendahl
    Inventor: Russ Milligan
  • Patent number: 4774036
    Abstract: A color ringed or rimmed edge intraocular lens for implant in either the anterior chamber, the posterior chamber or the cornea of the eye. The lens has a colorless or clear central region of a material such as polymethylmethacrylate (PMMA) and a peripheral surrounding portion of a dark material such as blue PMMA. Polysulfone can also be utilized. The lens can be fabricated by passing a clear rod of optical quality PMMA through an extrusion orifice and coating the circumference of the rod with a layer of predetermined thickness of colored, preferably blue PMMA or other compatible material. Other methods of fabrication can include the introduction of a suitable dye into the outer regions of the rod, or joining the clear central region to a ring of colored material by thermal adhesive bonding or other known processes.
    Type: Grant
    Filed: April 22, 1987
    Date of Patent: September 27, 1988
    Assignee: Dennis T. Grendahl
    Inventors: William LeMaster, Dennis T. Grendahl