| 11804205 |
Acoustic filter and method of manufacturing |
Pieter Gerard Van 'T Hof |
2023-10-31 |
| 11463803 |
Acoustic device with deformable shape as valve |
Nishant Lawand, Krisztian Kepiro |
2022-10-04 |
| 11438709 |
Acoustic filter with enhanced valve stroke |
Adrian Lara-Quintanilla, Pieter Gerard Van 'T Hof |
2022-09-06 |
| 11273076 |
Acoustic valve and ear plug for hearing protection |
Pieter Gerard van't Hof |
2022-03-15 |
| 11266532 |
Acoustic filter with attenuation control |
Pieter Gerard Van 'T Hof, Adrian Lara-Quintanilla |
2022-03-08 |
| 9930454 |
Method and system for testing a mould shape quality of a user-customized ear mould |
Pieter Gerard van't Hof |
2018-03-27 |
| 8689931 |
Ear protector with a sound damping filter, sound damping filter for such an ear protector as well as method for manufacturing a sound damping filter for such an ear protector |
— |
2014-04-08 |
| 8155338 |
Earplug for insertion into an auditory duct |
— |
2012-04-10 |
| 7783056 |
Earplug |
— |
2010-08-24 |
| 7706561 |
Electroacoustic transducer with a diaphragm and method for fixing a diaphragm in such transducer |
Aart Zeger van Halteren, Hendrik Dolleman, Paul Christiaan van Hal |
2010-04-27 |
| 6950529 |
System consisting of a microphone and an amplifier |
— |
2005-09-27 |
| 6084972 |
Integrated microphone/amplifier unit, and amplifier module therefor |
Aart Zeger van Halteren |
2000-07-04 |
| 6078677 |
Electroacoustic transducer with improved diaphragm attachment |
Henk Dolleman, Onno Geschiere, Paul Christiaan van Hal |
2000-06-20 |