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| US4023174 | 19 Oct 1960 | 10 May 1977 | The United States of America as represented by the Secretary of the Navy | Magnetic ceramic absorber |
| US4523160 | 2 May 1983 | 11 Jun 1985 | | Waveguide polarizer having conductive and dielectric loading slabs to alter polarization of waves |
| US4620168 | 9 May 1984 | 28 Oct 1986 | Thomson CSF | Coaxial type tunable hyperfrequency elimination band filter comprising of dielectric resonators |
