Patents by Inventor Hans-Albert Kurzhals

Hans-Albert Kurzhals 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 the selective extraction of caffeine from vegetable materials
    Patent number: 4255458
    Abstract: Method of removing caffeine from vegetable materials using a solvent containing two components:(a) a first component which is inherently gaseous under operational conditions, and (b) a second component which, by itself, has physical properties such that a mixture of (a) and (b) is liquid at the operating temperature.
    Type: Grant
    Filed: June 12, 1978
    Date of Patent: March 10, 1981
    Assignee: Hag Aktiengesellschaft
    Inventors: Ludwig Roselius, Hans-Albert Kurzhals, Peter Hubert
  • Process for the removal of undesirable constituents from raw coffee beans
    Patent number: 4215150
    Abstract: A process for the removal from raw coffee of constituents which contribute to the presence of undesired stimulants in roasted coffee, without changing the caffeine content. The process comprises treating the raw beans with the ester of an organic acid, in combination with a ketone.
    Type: Grant
    Filed: May 1, 1978
    Date of Patent: July 29, 1980
    Assignee: decofa Kaffee-Bearbeitungs-GmbH
    Inventors: Hans-Albert Kurzhals, Klaus F. Sylla
  • Process for the decaffeination of raw coffee beans
    Patent number: 4207352
    Abstract: A process for the decaffeination of raw coffee beans. Coffee beans containing 15 to 55 percent water are treated with the ester of an organic acid, in combination with a ketone.
    Type: Grant
    Filed: May 1, 1978
    Date of Patent: June 10, 1980
    Assignee: decofa Kaffee-Bearbeitungs-GmbH, Fabrikenufer
    Inventors: Hans-Albert Kurzhals, Klaus F. Sylla
  • Process of extracting stimulants from coffee
    Patent number: 4168324
    Abstract: A method of producing coffee low in undesired stimulants by removing coffee wax from unroasted coffee by the use of a supercritical fluid and absorbing the coffee wax in an absorbent precharged with pure caffeine.
    Type: Grant
    Filed: February 25, 1977
    Date of Patent: September 18, 1979
    Assignee: HAG Aktiengesellschaft
    Inventors: Ludwig Roselius, Hans-Albert Kurzhals, Klaus F. Sylla, Peter Hubert