US Patent 5,492,111
United States Patent and Trademark Office
University of Iowa Research Foundation (Oakdale, IA, US)
In the process of using sevoflurane as a rapid anesthetic, breakdown of the anesthetic to harmful compound A is slowed if not stopped altogether by cooling the CO2 scrubber to temperatures that still allow it to work effectively as scrubber but avoid sevoflurane degradation.
Tinker, John H. and Baker, Max T. Method of elimination of volatile degradation products of sevoflurane during anesthesia. US Patent 5,492,111 filed August 12, 1993 and issued February 20, 1996. https://ir.uiowa.edu/patents/147