P22. “An A/D converter of voltages U sin Fi and U cos Fi into digital value of the phase-angle Fi”, L.S. Czarnecki, Polish Patent No. 135 726, 1988.

P21. “An analyzer of active power in nonsinusoidal systems”, L.S. Czarnecki, Polish Patent No. 131 575, 1987.

P20. “An analyzer of reactive power in nonsinusoidal systems”, L.S. Czarnecki, Polish Patent No. 131 574, 1987.

P19. “Converter of reactive current RMS value in nonsinusoidal system into a DC voltage”, L.S. Czarnecki, Polish Patent No. 131 394, 1987.

P18. “A converter of the load conductance for harmonic frequencies into a DC voltage”, L.S. Czarnecki, Polish Patent No. 134 452, 1987.

P17. “A converter of the optimal compensating capacitance in a nonsinusoidal system into a DC voltage”, L.S. Czarnecki, Polish Patent No. 134 455, 1987.

P16. “A method of conductance for harmonic frequency conversion into a DC voltage”, L.S. Czarnecki, Polish Patent No. 134 451, 1987.

P15. “A method of conversion of the impedance phase angle for harmonic frequencies into a pair of DC voltages proportional to the sine and cosine functions of this angle”, L.S. Czarnecki, Patent No. 132 362, 1987.

P14. “A method of conversion of the impedance phase angle for harmonic frequencies into a pair of DC voltages proportional to the sine and cosine functions of this angle”, L.S. Czarnecki, Patent No. 132 325, 1986.

P13. “A method of obtaining a DC voltage proportional to the load conductance for harmonic frequency”, L.S. Czarnecki, Polish Patent No. 132 189, 1986.

P12. “A method of susceptance for harmonic frequency conversion into DC voltage”, L.S. Czarnecki, Polish Patent No. 132 190, 1986.

P11. “Converter of reactive current RMS value in nonsinusoidal system into a DC voltage”, L.S. Czarnecki, Polish Patent No. 131 383, 1986.

P10. “A method of reactive power in nonsinusoidal systems conversion into a DC voltage”, L.S. Czarnecki, Polish Patent No. 127 416, 1985.

P9. “A circuit for shifting harmonic phase by pi/2 “, L.S. Czarnecki, Polish Patent No. 119 477, 1983.

P8. “A circuit that transforms input voltage into Hilbert Transform”, L.S.Czarnecki, Polish Patent No. 119 264, 1983.

P7. “A circuit that transforms input voltage into Hilbert Transform”, L.S.Czarnecki, Polish Patent No. 119 260, 1983.

P6. “A low-pass active filter”, L.S. Czarnecki, Polish Patent No. 108 791, 1981.

P5. “A circuit for reactance function realization”, L.S. Czarnecki, Polish Patent No. 105 403, 1980.

P4. “A reactive power meter for nonsinusoidal systems”, L.S. Czarnecki, Polish Patent No. 85 524, 1977.

P3. “A reactive power meter for nonsinusoidal systems” , L.S. Czarnecki, Polish Patent No. 75 834, 1975.

P2. “A method of calibration of an active filter of a harmonic spectrum analyzer” , L.S. Czarnecki, Polish Patent No. 59181, 1970.

P1. “A method of calibration of a harmonic analyzer” , L.S. Czarnecki, Polish Patent No. 56 951, 1969.