US10307447B2 – June 4, 2019 – Freeze dry process

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Inventors :

Stephen Goldner

Owner :

Goldner, Stephen

Application Number :


Document Number :


Priority Date :

March 7, 2017

Filing Date :

March 7, 2017

Date of Grant/ Publication :

June 4, 2019

Class :

; A61K36 / 00; A61K36 / 185


A process includes reducing one or more pieces of cannabis plant matter to a powder by freeze-drying the one or more pieces of cannabis plant matter, and then extracting one or more chemicals from the powder by pressurizing the powder in a pressure vessel with along with liquid or supercritical carbon dioxide. The carbon dioxide dissolves the one or more chemicals. The powder is then depressurized to precipitate the one or more chemicals out of the carbon dioxide, and the precipitated chemicals can then be collected. For example, the freeze-drying ruptures the plant cells in the cannabis plant matter, thereby exposing or releasing the chemicals in the plant cells.


1. A process consisting essentially of: rupturing plant cells of cannabis by freeze-drying the cannabis in order to expose or release one or more cannabinoids in the plant cells of the cannabis; after rupturing the cannabis plant cells, extracting one or more of the cannabinoids from the cannabis by pressurizing the cannabis in a pressure vessel with along with supercritical carbon dioxide, the supercritical carbon dioxide dissolving the one or more cannabinoids, followed by depressurizing the cannabis in the pressure vessel, wherein the depressurizing precipitates the one or more cannabinoids out of the supercritical carbon dioxide; isolating the one or more cannabinoids that precipitated from the supercritical carbon dioxide; and wherein the freeze drying is performed below the triple point of water.


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