01

Lithium Recovery from Geothermal Brine Salton Sea Project by Peter Ehren (1997) Center for Minerals Technology, BHP Minerals-Department of Raw Materials, TU Delft.

02

Houston, John & Butcher, A. & Ehren, Peter & Evans, Keith & Godfrey, Linda. (2011). The Evaluation of Brine Prospects and the Requirement for Modifications to Filing Standards. Economic Geology. 106. 10.2113/econgeo.106.7.1225.

03

Book chapter (pp.2247-2259). Lithium and Boron Extraction from the Rhyolite Ridge Ore Nevada USA: Proceedings of the First Global Conference on Extractive Metallurgy. January 2018 DOI:10.1007/978-3-319-95022-8_189

04

The patent US9994930B2, titled "Process for producing lithium carbonate from concentrated lithium brine," was filed on September 15, 2011, by Orocobre Ltd. The inventors listed are Peter Ehren and Jose De Castro Alem. The patent was granted on June 12, 2018, and is currently active, with an adjusted expiration date of December 29, 2033. The current assignee is Allkem Ltd.

05

​In US11708278B2, granted in July 2023, Ehren outlines methods for producing lithium hydroxide and lithium carbonate using various salt and CO₂ combinations. Assigned to Lithium Ark Holding BV.

06

Lithium Ark patent US11931701B2, was granted in March 2024. Peter Ehren presents advanced systems for producing lithium hydroxide and lithium carbonate, leveraging a reciprocal salt chemistry. The patent includes a method where lithium hydroxide reacts directly with carbon dioxide to form lithium carbonate, offering a streamlined path for lithium refinement.

07

Peter Ehren is the inventor of EP4491577A1, a European patent application assigned to Lithium Ark Holding BV. It describes an innovative process for producing lithium hydroxide and lithium carbonate through a reciprocal salt system. The method involves reacting potassium hydroxide with lithium chloride, resulting in the crystallization of lithium hydroxide and potassium salts.