BARTHOLD FRED O has a total of 25 patent applications. Its first patent ever was published in 1964. It filed its patents most often in United States, China and WIPO (World Intellectual Property Organization). Its main competitors in its focus markets electrical machinery and energy, machines and audio-visual technology are INT POWER DEVICES INC, IDE OSAMU and PARK CHAN WOONG.
# | Country | Total Patents | |
---|---|---|---|
#1 | United States | 9 | |
#2 | China | 4 | |
#3 | WIPO (World Intellectual Property Organization) | 4 | |
#4 | Canada | 2 | |
#5 | EPO (European Patent Office) | 2 | |
#6 | Israel | 2 | |
#7 | Australia | 1 | |
#8 | Mexico | 1 |
# | Industry | |
---|---|---|
#1 | Electrical machinery and energy | |
#2 | Machines | |
#3 | Audio-visual technology | |
#4 | Environmental technology | |
#5 | Basic communication technologies |
# | Name | Total Patents |
---|---|---|
#1 | Barthold Fred O | 23 |
Publication | Filing date | Title |
---|---|---|
US2015194874A1 | Harmonic displacement reduction | |
US2014340188A1 | Planar core with high magnetic volume utilization | |
US2014300442A1 | Planar core-type uniform external field equalizer and fabrication | |
US2009174376A1 | DC-DC converter | |
AU1917495A | Full wave buck boost power converter with buck power converter properties | |
CA2182263A1 | Full wave buck boost power converter with buck power converter properties | |
US4734839A | Source volt-ampere/load volt-ampere differential converter | |
US4042844A | Power transistor switch | |
US3360710A | Converter-alternating current or direct current to alternating current, with continuously variable adjustment of output frequency and voltage |