Granted Patent
Utility
US 4,577,817 · App. 06/561,415
Three-dimensional vacuum envelope
Inventor:
Santiago Hernandez
Patented Case
View Patent ↗
Granted: Mar 25, 1986
Filed: Dec 14, 1983
Inventor
Santiago Hernandez
Assignee (at issue)
Gulf Eastern Manufacturing Company
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.