Patents by Inventor Jarmo Toikka

Jarmo Toikka 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).

  • Process for the preparation of sennosides A and B
    Patent number: 5574151
    Abstract: The invention concerns a process for the preparation of sennosides A and B, wherein rheinanthrone-8-glucoside is oxidized with oxygen or an oxygen source to the sennosides A and B. According to the invention, the oxidation is carried out using active carbon as a catalyst, and, if desired, the obtained sennosides A and B are converted to their calcium salts using methanol precipitation from a calcium ion containing aqueous solution.
    Type: Grant
    Filed: December 16, 1994
    Date of Patent: November 12, 1996
    Assignee: Leiras Oy
    Inventor: Jarmo Toikka
  • Process for the purification of hemin, a novel derivative and process for its preparation
    Patent number: 5233034
    Abstract: Process for the purification of hemin by dissolving raw hemin into 1,3-dimethyl-2-imidazolidinone (DMI), the mixture is allowed to cool in order to crystallize the hemin in the form of a 1:3-adduct of hemin and DMI, whereafter the adduct obtained is split by mixing the same with warm water, a lower alcohol or in a mixture thereof, or by heating in a vacuum, and the liberated hemin is recovered. The invention also concerns a novel hemin derivative, that is the 1:3-adduct of hemin and DMI, and a process for its preparation.
    Type: Grant
    Filed: October 17, 1991
    Date of Patent: August 3, 1993
    Assignee: Huhtamaki Oy
    Inventor: Jarmo Toikka