Granted Patent
Utility
US 4,844,852 · App. 07/127,343
Method and apparatus for severing three dimensional thermoplastic articles
Inventors:
Stephen Richard Keyser, David J. Vadney
Patented Case
View Patent ↗
Granted: Jul 4, 1989
Filed: Dec 1, 1987
Inventors
Stephen Richard Keyser
David J. Vadney
Assignee (at issue)
Mobil Oil 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.