Patents by Inventor Harry Sadjian

Harry Sadjian 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).

  • Optical recording device enploying doped crystal for optically storing information
    Patent number: 4811289
    Abstract: An optical recording device includes a crystal selected from the group of alkali metal halides or alkali-earth halides and is doped with an alkali metal dopant and negative hydride ions to form a doped crystal. The doped crystal is formed to have a hydride light absorption band centered about a predetermined frequency and a color center light absorption band centered about another predetermined frequency. The doped crystal exhibits two switching states with the first state having a predetermined light absorbance level in the hydride band and a relative low light absorbance level in the color center band relative to the other state and a second state having generally the same absorbance level in the hydride band and a relatively high light absorbance level in the color center band relative to the first state.
    Type: Grant
    Filed: January 30, 1987
    Date of Patent: March 7, 1989
    Inventor: Harry Sadjian
  • Optical recording device
    Patent number: 4649518
    Abstract: An optical recording device includes a crystal selected from the group of alkali metal halides or alkali-earth halides and is doped with an alkali metal dopant and negative hydride ions to form a doped crystal. The doped crystal is formed to have a hydride light absorption band centered about a predetermined frequency and a color center light absorption band centered about another predetermined frequency. The doped crystal exhibits two switching states with the first state having a light absorption level in the hydride band and a low light absorption level in the color center band and a second state having a light absorption level in the hydride band and a high light absorption level in the color center band.
    Type: Grant
    Filed: July 8, 1985
    Date of Patent: March 10, 1987
    Inventor: Harry Sadjian