# US 10,307,447 B2 · Freeze dry process

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- Number: US 10,307,447 B2
- Document ID: US10307447B2
- Status: Granted
- Kind: B2
- Application number: 15/451,928
- Filed: 2017-03-07
- Published: 2017-09-07
- Granted: 2019-06-04
- Earliest claimed: 2016-03-07
- Applicants: Stephen Goldner
- Inventors: Stephen Goldner
- Web page: https://patentgrep.com/patent/US10307447B2

## CPC

- A61K 36/3482: {Cannabis}
- B01D 11/0203: {with a supercritical fluid}
- A61K 2236/17: involving drying, e.g. sun-drying or wilting
- A61K 2236/37: Extraction at elevated pressure or temperature, e.g. pressurized solvent extraction [PSE], supercritical carbon dioxide extraction or subcritical water extraction
- A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D)
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)

## Abstract

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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

The process as recited in claim 1, wherein the depressurizing is conducted at several pressure intervals.