Granted Patent
Utility
US 4,980,934 · App. 07/367,998
Retrofittable receptor device
Inventors:
Donald E. Dahowski, Stephen F. Gray, Sr.
Patented Case
View Patent ↗
Granted: Jan 1, 1991
Filed: Jun 19, 1989
Inventors
Donald E. Dahowski
Stephen F. Gray, Sr.
Assignee (at issue)
Quaker Plastic Corporation
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.