** Shares of Talga Group TLG.AX rise as much as 7.8% to A$0.415, hitting their highest level since Dec. 12
** Stock marks its biggest intraday pct gain since Oct. 17
** Specialty miner secures Japanese patent for making natural graphite anodes for lithium-ion batteries
** Says patent gives co exclusive rights until at least 2040
** Technology helps in fast charging for electric vehicles and robotics
** Stock fell about 16% in 2025
(Reporting by Rajasik Mukherjee in Bengaluru)
((Rajasik.Mukherjee@thomsonreuters.com))