the coffee grounds remained in the filter which could then simply be removed and thrown away the simple procedure was an immediate hit with coffee drinkers. in the nineteen sixty the company started producing electric coffee machines to go with its filters all the while continuing to improve on the filter material testing different types of paper for them. because here paul was the paper s very porous relatively thick but permeable to water the pores are small enough to hold back even finely ground coffee coffee to work. the exact make up of original cone shaped paper filters is a company secret. the militant group based in mindanao is no one international