1. I. Pacheva, N. Avramov, N. Hristov, N. Sabotinov and P. Pramatarov, Bulg. Inv. Cert. Appl. No. 16377, /1970 - A method for producing multi-layer dielectric coatings, in particular for lasers, (1970)

2. N. Sabotinov and S. Kalchev, Bulg. Inv. Cert. Appl. No. 20693, /June 09, 1971 - Gas laser (He-Cd-Se)(1971)

3. N. Sabotinov and S. Kalchev, Bulg. Inv. Cert. Appl. No. 21860, /November 14, 1972 - Gas laser, (1972)

4. N. Sabotinov and P. Telbizov, Bulg. Inv. Cert. Appl. No. 25550, /January 21, 1973 - Gas laser (He-Ne-Cd-Se), (1973)

5. N. Sabotinov and P. Telbizov, Bulg. Inv. Cert. Appl. No. 23098, /March 27, 1973 - Gas laser (He-Se-Ne)(1973)

6. N. Sabotinov, P. Telbizov and S. Kalchev, Bulg. Inv. Cert. Appl. No. 29874 - Copper vapor gas laser, (1975)

7. N. Sabotinov and N. Vuchkov, Bulg. Inv. Cert. Appl. No. 35663, /March 14, 1977 - Hollow cathode metal vapor laser, (1977)

8. N. Sabotinov and N. Vuchkov, Bulg. Inv. Cert. Appl. No. 36636, /June 06, 1977 – A tool for determination ofthe optical properties of Brewster windows, (1977)

9. N. Sabotinov, N. Vuchkov, M. Grozeva and P. Telbizov, Bulg. Inv. Cert. Appl. No. 52167, /May 25, 1981 – Ahollow cathode discharge laser tube, (1981)

10. N. Sabotinov, M. Grozeva and I. Angelov, Bulg. Inv. Cert. Appl. No. 61383, /June 20, 1983 - Gas-dischargelaser tube, (1983)

11. N. Sabotinov, N. Vuchkov, D. Astadjov, G. Petrash, M. Kazarian and K. Zemskov, Bulg. Inv. Cert. Appl. No. 63007, /November 11, 1983 - Gas discharge tube for copper halide vapor laser, (1983)

12. N. Sabotinov, N. Vuchkov and D. Astadjov, Bulg. Inv. Cert. Appl. No. 65131, /April 18, 1984 - Gas discharge tube for copper halide vapor laser, (1984)

13. N. Sabotinov, N. Vuchkov and D. Astadjov, Bulg. Inv. Cert. Appl. No. 69199, /March 12, 1985 - Gas discharge tube for copper halide vapor laser, (1985)

14. N. Sabotinov, N. Vuchkov and D. Astadjov, US Patent Appl. No.4,635,271, /January 06, 1987; Deutsches Patentamt DE 35 13869 A1, /October 10, 1985; French Patent Appl. No. 8505789, /April 17, 1985; UK Patent Appl. No. 8509776, /April 17, 1985, Bulg. Inv. Cert. Appl. No.989, /1985 - Copper halide vapour laser, (1985)

15. N. Sabotinov, M. Grozeva and I. Angelov, Bulg. Inv. Cert. Appl. No. 73101, /January 14, 1986 – Gas dischargetube for hollow cathode metal vapor laser, (1986)

16. N. Sabotinov, N. Vuchkov and D. Astadjov, Bulg. Inv. Cert. Appl. No. 78321, /February 03, 1987 – Self terminating laser, (1987)

17. N. Sabotinov, M. Grozeva and I. Angelov, British Patent Appl. No. 8712666, /May 29, 1987, US Patent Appl. No. 091.808, /January 22, 1988, Gas discharge tube with hollow cathode for vapour lasers, (1987)

18. N. Sabotinov and P. Telbizov, Bulg. Inv. Cert. Appl. No. 83528, /March 30, 1989 - A gas discharge tube for RF transversely excited metal vapor laser with increased life time, (1989)

19. N. Sabotinov, N. Vuchkov and D. Astadjov, Bulg. Inv. Cert. Appl. No. 86951, /January 20, 1989 – Self terminating laser, (1989)

20. P. Davis, N. Sabotinov, N. Vuchkov and D. Astadjov, Common wealth of Australia Patent, /May 04,1989 - Improvements to vapour lasers, (1989)

21. N. Sabotinov, M. Grozeva, I. Angelov, Bulg. Inv. Cert. Appl. No. 1145 (1990), USA, UK, Russia – Gas discharge tube for a metal vapor laser, (1990)

22. N. Sabotinov and K. Dimitrov, Bulg. Inv. Cert. Appl. No. 105357, /19.03.2001 - Gas laser with copper halides, (2001)

23. N. Sabotinov, Bulg. Inv. Cert. Appl. No. 105358, /19.03.2001, Bulgaria Patent No.:64017B1 - Gas laser with copper, (2001)

24. N. Sabotinov, N. Vuchkov and K.Temelkov, Bulg. Inv. Cert. Appl. No. 103312, /16.04.1999, Bulgaria Patent No.:63556, - Gas laser, (2002)

25. N. Sabotinov and T. Petrov, Bulg. Inv. Cert. Appl. No. 105695, /11.07.2001, Bulgaria Patent No. 64493 B1,2004 – Ultraviolet gold ion laser, (2004)

26. N. Vuchkov, K. Temelkov, P. Zahariev and N.Sabotinov, Bulgaria patent No. 64880, /03.08.2006, Laser tube for ultraviolet copper laser,  (2006)

27. M. Grozeva, D. Mihailova, N. Sabotinov, Bulg. Inv. Cert. Appl. No. 1009866/02.05.2007, Gas-discharge tube for sputtered hollow cathode laser, (2007)

28. N. Vuchkov, K. Temelkov, N. Sabotinov, BG patent No. 66247, Laser tube for strontium infrared laser with strontium halide vapours, (2012)