Granted Patent
Utility
US 4,215,607 · App. 05/908,398
Apparatus for heat cutting sheet material
Inventors:
Wilber G. Hudson, Ronald B. Welch
Patented Case
View Patent ↗
Granted: Aug 5, 1980
Filed: May 22, 1978
Inventors
Wilber G. Hudson
Ronald B. Welch
Assignee (at issue)
Lummus Industries, 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.