Granted Patent
Utility
US 4,337,589 · App. 06/165,264
Method of making hinged pop-up items
Inventors:
John K. Volkert, Ib Penick, Robert B. Volkert
Patented Case
View Patent ↗
Granted: Jul 6, 1982
Filed: Jul 2, 1980
Inventors
John K. Volkert
Ib Penick
Robert B. Volkert
Assignee (at issue)
Compak Systems Limited
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.