Patents by Inventor Terri Lichtenstein

Terri Lichtenstein 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: 4623784
    Abstract: A laser recording apparatus for optically recording information on a medium. A laser radiates a beam through an off-center lens. The lens deflects and focusses the beam onto a recording medium at a slight angle. The reflected beam returns through the lens on the opposite side of the optic axis from the incident beam. A mirror in the optical path directs the beam to a photodetector. The apparatus has broadband capabilities and is particularly useful at eliminating unwanted optical feedback when recording onto media having a birefringent protecting layer. Recording errors due to dirt and scratches may be detected by a second embodiment that has two lasers emitting light of different frequencies which upon reflection are detected and compared.
    Type: Grant
    Filed: December 20, 1984
    Date of Patent: November 18, 1986
    Assignee: Drexler Technology Corporation
    Inventors: Richard Haddock, Terri Lichtenstein