Granted Patent
Utility
US 5,494,430 · App. 08/338,894
Plastic tube corrugator with mold blocks
Inventors:
John S. Berns, Heinrich Dickhut
Patented Case
View Patent ↗
Granted: Feb 27, 1996
Filed: Nov 14, 1994
Inventors
John S. Berns
Heinrich Dickhut
Assignee (at issue)
Cullom Machine Tool & Die, Inc.
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.