Granted Patent
Utility
US 4,304,816 · App. 06/083,154
Channel-shaped strip structures
Inventors:
Robert G. Bright, Helmut Theisen
Patented Case
View Patent ↗
Granted: Dec 8, 1981
Filed: Oct 9, 1979
Inventors
Robert G. Bright
Helmut Theisen
Assignee (at issue)
Draftex Development A.G.
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.