Reflect Scientific Inc (RSCF)

[petermic]

Here's one owned by Praxair, a company more likely to supply a large amount of the needed technology.

Transportable container, charger system, method and kit for generation of carbon dioxide snow block in-situ within the transportable container for preservation of items stored therewithin

This invention relates to a novel kit, transportable apparatus and method for generating in-situ CO2 snow block within the apparatus. An item such as a biological sample can be stored and transported within the same apparatus that is employed for creating the CO2 snow block. The apparatus is capable of preserving the sample during transport. The invention also includes a specially designed CO2 snow charger system including a charger and meshed conduit. The charger system is operated in accordance with the methods of the present invention to create the in-situ CO2 snow block within a container that can be also used for transport.

https://uspto.report/patent/grant/10,712,072