* Samsung says no plan to acquire Blackberry
* S.Korea firm offered up to $7.5 bln to buy Canada firm -source (Updates with comments from Blackberry, Samsung)
SEOUL, Jan 15 (Reuters) - South Korea's Samsung Electronics Co Ltd said on Thursday that it had no plan to buy Canada's Blackberry Ltd, denying a Reuters report on a takeover approach.
"Media reports of the acquisition are groundless," a Samsung spokeswoman told Reuters.
Samsung recently offered to buy BlackBerry for as much as $7.5 billion, seeking its valuable patents as it battles Apple in the corporate market, according to a person familiar with the matter and documents seen by Reuters.
Blackberry said in a statement that it had not engaged in discussions with Samsung with respect to any purchase offer. (Reporting by Se Young Lee; Editing by Paul Tait abd Stephen Coates)