Patents by Inventor Lennart A. T. Wieslander

Lennart A. T. Wieslander 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 of preserving teeth with attached live root membrane
    Patent number: 3983712
    Abstract: The invention is concerned with a method of preserving extracted teeth with attached live root membrane. After treating the teeth in order to eliminate bacteria and fungi in a nutrient solution to preserve the viability of the root membrane cells the teeth are subjected to a freezing process in two stages and in the presence of a similar nutrient fluid, the temperature being lowered slowly in the first stage to a value between -20.degree. and -50.degree.C and rapidly in the second stage to a value below -50.degree.C, preferably below -150.degree.C.
    Type: Grant
    Filed: March 25, 1975
    Date of Patent: October 5, 1976
    Inventors: Per-Osten Soder, Lennart A. T. Wieslander