Granted Patent
Utility
US 4,286,728 · App. 06/139,248
Tab and ecology end
Inventors:
Ermal C. Fraze, Omar L. Brown
Patented Case
View Patent ↗
Granted: Sep 1, 1981
Filed: Apr 11, 1980
Inventors
Ermal C. Fraze
Omar L. Brown
Assignee (at issue)
Ermal C. Fraze
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.