Вот список американских патентов об этом.
А вообще-то Панасоник запатентовал этот фильтр много лет назад.
Любой патент можно почитать здесь:
http://patft.uspto.gov/netahtml/PTO/search-bool.html
PAT. NO. Title
1 7,204,038 Full-Text Hairdryer with electrostatic precipitator and filter cleanout warning
2 7,160,363 Full-Text Electrostatic filter construction
3 7,067,939 Full-Text High-voltage pulse generator for an electrostatic filter
4 6,972,644 Full-Text Surface acoustic wave ladder filter device having resonators with different electrode pitches and electrostatic capacitances
5 6,964,698 Full-Text Gas supply for electrostatic filter and electrostatic filter arrangement
6 6,926,758 Full-Text Electrostatic filter
7 6,773,488 Full-Text Electrostatic filter and a method thereof
8 6,760,455 Full-Text Electrostatic loudspeaker with a distributed filter
9 6,656,253 Full-Text Dynamic electrostatic filter apparatus for purifying air using electrically charged liquid droplets
10 6,576,107 Full-Text Electrostatic filter for dielectric fluid
11 6,514,324 Full-Text High efficiency active electrostatic air filter and method of manufacture
12 6,284,118 Full-Text Electrostatic filter for dielectric fluid
13 6,245,231 Full-Text Fuel filter apparatus with anti-electrostatic function
14 6,241,810 Full-Text Electrostatic filter and supply air terminal
15 6,129,829 Full-Text Electrostatic filter for dielectric fluid
16 6,090,189 Full-Text Electrostatic filter and supply air terminal
17 6,063,167 Full-Text Frameless electrostatic air filter with internal support grill
18 5,999,069 Full-Text Surface acoustic wave ladder filter having a parallel resonator with a larger electrostatic capacitance
19 5,993,521 Full-Text Two-stage electrostatic filter
20 5,989,320 Full-Text Frameless electrostatic air filter with internal support grill
21 5,935,303 Full-Text Electrostatic filter
22 5,934,261 Full-Text Electrode for electrostatic filter
23 5,903,450 Full-Text Electrostatic precipitator power supply circuit having a T-filter and pi-filter
24 5,900,043 Full-Text Electrostatic filter with process for fast cleaning without breaking confinement
25 5,871,567 Full-Text Dual Media air filter with electrostatic charge
26 5,855,636 Full-Text Method which removes odor and pollutants when preparing cullet for use in an electrostatic bed filter
27 5,846,302 Full-Text Electrostatic air filter device
28 5,800,769 Full-Text Method for forming an electrostatic fibrous filter web
29 5,797,978 Full-Text Air filter including electrostatic precipitation, and method of operating same
30 5,792,242 Full-Text Electrostatic fibrous filter web
31 5,785,834 Full-Text Electrostatic filter
32 5,779,748 Full-Text Method which removes odor and pollutants when preparing cullet for use in an electrostatic bed filter
33 5,773,529 Full-Text Method and apparatus which removes odor and pollutants when preparing cullet for use in an electrostatic bed filter
34 5,766,318 Full-Text Precipitator for an electrostatic filter
35 5,645,704 Full-Text Electrostatic filter device
36 5,630,926 Full-Text Electrostatic filter
37 5,587,005 Full-Text Air purifier apparatus with an electrostatic filter
38 5,571,399 Full-Text Electrostatic fluid filter and system
39 5,549,735 Full-Text Electrostatic fibrous filter
40 5,540,756 Full-Text Electrostatic filter and method of filtering dust
41 5,484,473 Full-Text Two-stage electrostatic filter with extruded modular components particularly for air recirculation units
42 5,471,377 Full-Text Process for controlling a power supply which supplies power to an electrostatic filter in which secondary circuit states are determined based on measured primary circuit values and in which short circuits are detected
43 5,433,772 Full-Text Electrostatic air filter for mobile equipment
44 5,382,359 Full-Text Plastic fuel filter with conductive coating for providing an evaporative barrier and for dissipating electrostatic charges
45 5,380,432 Full-Text Fuel filter with electrostatic charge preventing media
46 5,352,347 Full-Text Electrostatic filter for non-conductive liquids
47 5,336,299 Full-Text Multi-loading electrostatic air filter and method of filtration
48 5,332,485 Full-Text Electrostatic filter
49 5,254,420 Full-Text Magenta toner for developing electrostatic images, colored resin, colored molded resin member and color filter
50 5,242,587 Full-Text Filter with porous media and electrostatic and magnetic plates