Patents by Inventor Dean Sylvester

Dean Sylvester 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).

  • Patent number: 8745909
    Abstract: The disclosed apparatus is a scissor-style action to be mounted to a firearm. In one embodiment the firearm is a semi-automatic firearm prior to removal of the stock action and attachment of the disclosed action. In one particular embodiment, the firearm is a rifle sold by the RugerĀ® company under the model name 10/22.
    Type: Grant
    Filed: November 4, 2013
    Date of Patent: June 10, 2014
    Assignee: Primary Weapons
    Inventor: Dean Sylvester
  • Patent number: 8590197
    Abstract: The disclosed apparatus and method facilitates modification of a firearm, such as an automatic, semi-automatic, bolt action, or other firearm to be modified to a scissor-style bolt action firearm. In one embodiment the firearm is a semi-automatic firearm prior to modification. In one particular embodiment, the firearm is a rifle sold by the Ruger company under the model name 10/22.
    Type: Grant
    Filed: May 3, 2012
    Date of Patent: November 26, 2013
    Assignee: Primary Weapons
    Inventor: Dean Sylvester
  • Patent number: 8468729
    Abstract: Disclosed herein is an improved buffer tube assembly comprising a buffer tube having a longitudinal forward end, a longitudinal rearward end, and an inner annular surface. The buffer tube further comprises an attachment location operably configured to couple the buffer tube to a lower receiver of a firearm. One novel feature is a dead blow buffer positioned at the longitudinally rearward portion of the buffer tube. The buffer tube comprising an external surface configured to fit within and substantially in contact with the internal bore surface of the buffer tube, wherein the dead blow buffer is configured to receive an impact from a buffer that is attached to a buffer spring fitted within the buffer tube. In one form, the dead blow buffer is positioned between the rearmost portion of the inner annular surface of the buffer tube and the buffer spring.
    Type: Grant
    Filed: January 18, 2011
    Date of Patent: June 25, 2013
    Assignee: Primary Weapons
    Inventor: Dean Sylvester
  • Patent number: 8042448
    Abstract: A muzzle device configured to be attached to the muzzle region of a barrel. The muzzle device has a compensator region positioned longitudinally rearward from a flash suppression region. The muzzle device further is provided with adjacent compensator ports in communication by a longitudinally extending access vent.
    Type: Grant
    Filed: January 26, 2009
    Date of Patent: October 25, 2011
    Assignee: Primary Weapons
    Inventors: Dean Sylvester, Todd Tuttle
  • Patent number: 4092472
    Abstract: A C-nucleoside compound, 2,4-dichloro-5-(2,3,5-Tri-O-acetyl-.beta.-D-Ribofuranosyl)pyrimidine, useful as a primary starting material in the synthesis of various C-nucleoside compounds having antitumor, antiviral and/or antibacterial activity. A structural formula is as follows: ##STR1## The location of the 2,4-dichloro members on the heterocycle, with the active sites of the carbohydrate being blocked, provides an intermediate compound well adapted for a variety of nucleophilic substitutions. Such procedures have yielded several novel analogs of known pyrimidine nucleosides found in RNA, as well as other compounds which have demonstrated chemotherapeutic utility.
    Type: Grant
    Filed: July 30, 1976
    Date of Patent: May 30, 1978
    Assignee: University of Utah
    Inventors: Leroy B. Townsend, Dean Sylvester Wise, Robert Arthur Earl