Granted Patent
Utility
US 4,329,933 · App. 06/276,430
Universal expansion module
Inventors:
Howard L. Beckerman, Robert Sedlatschek
Patented Case
View Patent ↗
Granted: May 18, 1982
Filed: Jun 22, 1981
Inventors
Howard L. Beckerman
Robert Sedlatschek
Assignee (at issue)
The Singer Company 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.