loadpatents
Patent applications and USPTO patent grants for Microtel, B.V..The latest application filed is for "electroacoustic transducer of the so-called "electret" type, and a method of making such a transducer".
Patent | Date |
---|---|
Electroacoustic transducer of the so-called "electret" type, and a method of making such a transducer Grant 4,910,840 - Sprenkels , et al. March 27, 1 | 1990-03-27 |
Electroacoustic transducer of the so-called "electret" type, and a method of making such a transducer Grant 4,908,805 - Sprenkels , et al. March 13, 1 | 1990-03-13 |
Electret transducer and a method for manufacturing an assembly of backplate, electret foil and diaphragm plate Grant 4,567,382 - van Halteren January 28, 1 | 1986-01-28 |
Electret transducers: acoustically transparent backplate of sintered conductive spheres and a thin electret coating; meshlike diaphragm spacing screen overlays apertured electret backplate with screen junctions overlaying the apertures Grant 4,160,881 - Smulders July 10, 1 | 1979-07-10 |
Moving armature transducer with reinforced and pivoted diaphragm Grant 4,126,769 - Broersma November 21, 1 | 1978-11-21 |
uspto.report is an independent third-party trademark research tool that is not affiliated, endorsed, or sponsored by the United States Patent and Trademark Office (USPTO) or any other governmental organization. The information provided by uspto.report is based on publicly available data at the time of writing and is intended for informational purposes only.
While we strive to provide accurate and up-to-date information, we do not guarantee the accuracy, completeness, reliability, or suitability of the information displayed on this site. The use of this site is at your own risk. Any reliance you place on such information is therefore strictly at your own risk.
All official trademark data, including owner information, should be verified by visiting the official USPTO website at www.uspto.gov. This site is not intended to replace professional legal advice and should not be used as a substitute for consulting with a legal professional who is knowledgeable about trademark law.