RF

Robert J. Fretz

IN Intricon: 8 patents #1 of 19Top 6%
RE Resound: 3 patents #8 of 29Top 30%
3M: 1 patents #7,233 of 11,543Top 65%
GA Gn Resound North America: 1 patents #3 of 14Top 25%
RT Resistance Technology: 1 patents #10 of 17Top 60%
📍 Maplewood, MN: #66 of 510 inventorsTop 15%
🗺 Minnesota: #4,938 of 52,454 inventorsTop 10%
Overall (All Time): #319,497 of 4,157,543Top 8%
15
Patents All Time

Issued Patents All Time

Showing 1–15 of 15 patents

Patent #TitleCo-InventorsDate
10687157 Head direction hearing assist switching 2020-06-16
10499165 Feedback reduction for high frequencies 2019-12-03
9571939 Hearing aid positioning system and structure Jean E. Daavettila, Christopher Drake Conger, Vincent Joseph Mako 2017-02-14
8767987 Ear contact pressure wave hearing aid switch 2014-07-01
8605927 Hearing aid positioning system and structure Jean E. Daavettila, Christopher Drake Conger, Vincent Joseph Mako 2013-12-10
8358797 Switch for a hearing aid 2013-01-22
8355517 Hearing aid circuit with feedback transition adjustment 2013-01-15
D671218 Hearing aid body Jean E. Daavettila, Vincent Joseph Mako 2012-11-20
7519193 Hearing aid circuit reducing feedback 2009-04-14
7027608 Behind the ear hearing aid system Cliff Miller, David Barnard 2006-04-11
6275596 Open ear canal hearing aid system Paul H. Stypulkowski, Richard T. Woods 2001-08-14
D424697 Eartip for hearing aid David Barnard 2000-05-09
D420135 Pair of hearing aid tubes David Barnard 2000-02-01
D420136 Eartip for use as a hearing aid David Barnard 2000-02-01
4730603 Receiver of amplitude modulated signals 1988-03-15