Granted Patent
Utility
US 4,552,600 · App. 06/443,992
Method and apparatus for manufacturing a purge trap tray
Inventors:
Stanislaus Laiewski, Thomas A. Hessen, Thomas R. Hardy, Allie F. Gilvin
Patented Case
View Patent ↗
Granted: Nov 12, 1985
Filed: Nov 23, 1982
Inventors
Stanislaus Laiewski
Thomas A. Hessen
Thomas R. Hardy
Allie F. Gilvin
Assignee (at issue)
W. R. Grace & Co., Cryovac Div.
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.