> A multifunctional logic module. Bulgarian patent 40824/1978.
> A successive approximation register. Bulgarian patent 51493/1981.
> A digital-to-analog converter. Bulgarian patent 54303/1981.
> A tester for microcomputers. Bulgarian patent 59008/1982.
> A microcomputer analog output system. Bulgarian patent 72853/1985.
> An analog output system. Bulgarian patent 78845/1987.
> A data acquisition system. Bulgarian patent 83070/1988.
> A single board computer. Bulgarian patent 88184/1989.