It was possible up to 1.11.2004, but not any more.
Who can act as an agent before the Polish Patent Office?
Is translation of the specification required when filing a foreign conventional patent (utility model) application?
EP validation in Poland
What are the effects of European patents in Poland?
The devil is in the details…, or from when one should count the 5-year period, during which it is possible not to use one’s trade mark without consequences?
Getting the Deal Through – Patents 2012