Granted Patent
Utility
US 4,572,521 · App. 06/643,570
T-Seal for polymeric extrusion system
Inventors:
Adrian D. Drost, Edward H. Ruscher
Patented Case
View Patent ↗
Granted: Feb 25, 1986
Filed: Aug 23, 1984
Inventors
Adrian D. Drost
Edward H. Ruscher
Assignee (at issue)
Kimberly-Clark 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.