Granted Patent
Utility
US 4,454,639 · App. 06/384,827
Method for tuning piezoelectric resonators
Inventors:
Lawrence N. Dworsky, Douglas H. Weisman, Loi Quang Ninh
Patented Case
View Patent ↗
Granted: Jun 19, 1984
Filed: Jun 3, 1982
Inventors
Lawrence N. Dworsky
Douglas H. Weisman
Loi Quang Ninh
Assignee (at issue)
Motorola, 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.