Professor Bozena Hilczer 
Technical activity
i) Technology of diaphragms for low-costs electret microphones - Polish Patent 132 372 (VI.1984). Electret microphones were produced in the Factory of Loudspeakers and Microphones TONSIL, Września, Poland (2 million in 1986).

ii) Technology of pyroelectric detectors based on piezopolymers (200 pyrodetectors were produced for the Factory of Loudspeakers and Microphones TONSIL in 1992).