Granted Patent
Utility
US 4,920,352 · App. 07/351,866
Retractable antenna
Inventors:
Nils Martensson, Michael B. Ashdown
Patented Case
View Patent ↗
Granted: Apr 24, 1990
Filed: May 12, 1989
Inventors
Nils Martensson
Michael B. Ashdown
Assignee (at issue)
Technophone Limited
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.