Patents by Inventor .ANG.ke Hornell

.ANG.ke Hornell 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).

  • Liquid crystal shutter with low twisted nematic liquid crystal cells driven with a low frequency or DC voltage
    Patent number: 6097451
    Abstract: A liquid crystal shutter construction (18), suitable for a glass shield and a welding glass filter, which shutter construction is able to switch between a high light absorbing dark state and a low light absorbing transparent state, and vice versa, comprising low twisted nematic type liquid crystal cells with a twisting angle between 0.degree. and just below 90.degree., and an electronic circuit output generating a variable cell driving voltage higher than about twice the threshold voltage for at least one of the liquid crystal cells and with a polarity switching frequency of less than 1 Hertz.
    Type: Grant
    Filed: June 25, 1997
    Date of Patent: August 1, 2000
    Assignee: Hornell International AB
    Inventors: Stephen Palmer, .ANG.ke Hornell