Granted Patent
Utility
US 4,158,539 · App. 05/904,587
Thermoforming machine with variable mold closed cycle
Inventors:
Albert W. Arends, George L. Pickard, G. Allan West, Edward J. Russell
Patented Case
View Patent ↗
Granted: Jun 19, 1979
Filed: May 10, 1978
Inventors
Albert W. Arends
George L. Pickard
G. Allan West
Edward J. Russell
Assignee (at issue)
Leesona Corporation
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.