Patents by Inventor Tuula Stark

Tuula Stark 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).

  • Method for measuring samples with liquid scintillation counting and a counter
    Patent number: 5367170
    Abstract: A method and a liquid scintillation counter for measuring a sample, a mixture of the specimen to be analysed and a scintillator, in a liquid scintillation counter where the sample (14) is measured with two photo multiplier tubes (23, 24) situated on different sides of the sample. The photo multiplier tubes situated on different sides of the sample operate in coincidence. Asymmetric samples are measured in such a way that the counting efficiency is measured with the photo multiplier tubes (23, 24) operating in coincidence ad calculated using the amount of coincidence pulses, whereas the amplitude and the pulse height distribution are measured only with one photo multiplier tube (23 or 24).
    Type: Grant
    Filed: November 9, 1992
    Date of Patent: November 22, 1994
    Assignee: Wallac Oy
    Inventors: Stuart Webb, Tapio Yrjonen, Tuula Stark, Timo Oikari
  • Method for measuring liquid scintillation samples deposited on multi-well sample plates
    Patent number: 5306914
    Abstract: A method for correcting measuring values when measuring liquid scintillation samples deposited on sample plates by a photodetector which will be affected by scintillation photons from other samples in the plate in addition to the sample being measured. Said correction is done by pre-determining affection of the other samples of the plate as a function of quench level and correcting observed measuring values using this information.
    Type: Grant
    Filed: September 23, 1992
    Date of Patent: April 26, 1994
    Assignee: Wallac Oy
    Inventors: Tapio Yrjonen, Timo Oikari, Tuula Stark