| 7082040 |
Power factor corrected UPS with improved connection of battery to neutral |
Joseph C. Paulakonis, Robert W. Johnson |
2006-07-25 |
| 6944035 |
Power factor corrected UPS with improved connection of battery to neutral |
Joseph C. Paulakonis, Robert W. Johnson |
2005-09-13 |
| 6661678 |
Power factor corrected UPS with improved connection of battery to neutral and methods of operation thereof |
Joseph C. Paulakonis, Robert W. Johnson |
2003-12-09 |
| 6400586 |
Power factor corrected UPS with improved connection of battery to neutral |
Joseph C. Paulakonis, Robert W. Johnson |
2002-06-04 |
| 6314007 |
Multi-mode power converters incorporating balancer circuits and methods of operation thereof |
Robert W. Johnson |
2001-11-06 |
| 6262899 |
Power factor corrected UPS maintaining neutral integrity and methods of operation thereof |
Joseph C. Paulakonis, Robert W. Johnson |
2001-07-17 |
| 6160722 |
Uninterruptible power supplies with dual-sourcing capability and methods of operation thereof |
James M. Thommes, Robert W. Johnson |
2000-12-12 |
| 6069412 |
Power factor corrected UPS with improved connection of battery to neutral |
Joseph C. Paulakonis, Robert W. Johnson |
2000-05-30 |
| 5436512 |
Power supply with improved circuit for harmonic paralleling |
Haroon Inam, Robert W. Johnson |
1995-07-25 |
| 4935861 |
Uninterrupted power supply having no low frequency power magnetics |
Robert W. Johnson, George W. Oughton, Jr. |
1990-06-19 |
| 4673825 |
Uninterruptible power supply with isolated bypass winding |
Robert W. Johnson, John G. Tracy, Blazej W. Sonnenberg |
1987-06-16 |
| 4255746 |
Emergency lighting and fire detector system |
Robert W. Johnson |
1981-03-10 |
| 4199754 |
Circuit for an emergency lighting and fire detector system |
Robert W. Johnson |
1980-04-22 |