Granted Patent
Utility
US 4,818,313 · App. 06/870,360
Method for regulating the energy supply to a sealing device for the sealing of thermoplastic material
Inventor:
Anders Sundberg
Patented Case
View Patent ↗
Granted: Apr 4, 1989
Filed: Jun 4, 1986
Inventor
Anders Sundberg
Assignee (at issue)
Tetra Pak International Aktiebolag
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.