Patents by Inventor Fredric Askham

Fredric Askham 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).

  • Holographic recording medium with control of photopolymerization and dark reactions
    Publication number: 20060194120
    Abstract: The present invention relates to a system, as well as articles and holographic recording medium comprising the system, where the system comprises: a polymerizable component comprising at least one photoactive polymerizable material; and a photoinitiator component comprising at least one photoinitiator for causing the polymerizable component to polymerize to thereby form a plurality of holographic gratings when activated by exposure to a photoinitiating light source; wherein when a portion of the polymerizable component has been polymerized to form at least one holographic grating, the unpolymerized portion of the polymerizable component is resistant to further polymerization when not exposed to the photoinitiating light source. The present invention also provides methods for forming at least one holographic grating in a holographic recording medium having such a photopolymerizable system.
    Type: Application
    Filed: February 28, 2005
    Publication date: August 31, 2006
    Applicant: INPHASE TECHNOLOGIES, INC.
    Inventors: Michael Cole, Fredric Askham, William Wilson
  • Tetrakis-pentafluorophenyl borates from pentafluorophenyl grignard reagents
    Patent number: 6231790
    Abstract: Pentafluorophenyl Grignard reagents are reacted with a boron trihalide in a non-ethereal solvent such as toluene to produce a tetrakis pentafluorophenyl borate magnesium halide.
    Type: Grant
    Filed: November 19, 1996
    Date of Patent: May 15, 2001
    Assignee: Boulder Scientific Company
    Inventor: Fredric Askham
  • Synthesis of n-silylated cyclopentaphenanthrene compounds
    Patent number: 6166267
    Abstract: A method of converting Compound A (1,3-dehydro-cyclopenta[1]phenanthren-2-one) to Compound C (1H-cyclopenta[1]penanthren) in situ in a single reactor is disclosed.
    Type: Grant
    Filed: September 2, 1999
    Date of Patent: December 26, 2000
    Assignee: Boulder Scientific Company
    Inventor: Fredric Askham
  • Synthesis of N-silylated cyclopentaphenanthrene compounds
    Patent number: 5965757
    Abstract: A method for the synthesis of certain N-silylated cyclopentaphenanthrene (Group IV metal) complexes is disclosed.
    Type: Grant
    Filed: February 4, 1998
    Date of Patent: October 12, 1999
    Assignee: Boulder Scientific Company
    Inventor: Fredric Askham
  • Conversion of hexafluorobenzene to bromopentafluorobenzene
    Patent number: 5744656
    Abstract: A method for producing tetrakis (pentafluorophenyl) borates is described. Hexafluorobenzene is converted to bromopentafluorobenzene which may be isolated and then reacted with an alkyl lithium to produce pentafluorophenyl lithium which in turn is reacted directly with an appropriate reagent to produce the desired borate.
    Type: Grant
    Filed: October 25, 1996
    Date of Patent: April 28, 1998
    Assignee: Boulder Scientific Company
    Inventor: Fredric Askham