Granted Patent
Utility
US 5,901,867 · App. 08/881,624
Ventable cap
Inventor:
Larry J. Mattson
Patented Case
View Patent ↗
Granted: May 11, 1999
Filed: Jun 24, 1997
Inventor
Larry J. Mattson
Assignee (at issue)
ROBERTS PLYPRO INC.
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.