Granted Patent
Utility
US 4,647,716 · App. 06/668,740
Article having heat expandable sealing member
Inventors:
James K. Akiyama, Klaus D. Freysing, Richard A. Young
Patented Case
View Patent ↗
Granted: Mar 3, 1987
Filed: Nov 6, 1984
Inventors
James K. Akiyama
Klaus D. Freysing
Richard A. Young
Assignee (at issue)
Sigmaform 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.