Granted Patent
Utility
US 4,070,741 · App. 05/788,317
Method of making an electret acoustic transducer
Inventor:
Svetislav V. Djuric
Patented Case
View Patent ↗
Granted: Jan 31, 1978
Filed: Apr 18, 1977
Inventor
Svetislav V. Djuric
Assignee (at issue)
Genrad, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.