Granted Patent
Utility
US 5,289,929 · App. 07/887,339
Tamper indicating means for vacuum closures
Inventors:
Robert J. Heilman, Daniel M. Carson, Robert E. Sparks, Norbert S. Mason
Patented Case
View Patent ↗
Granted: Mar 1, 1994
Filed: May 22, 1992
Inventors
Robert J. Heilman
Daniel M. Carson
Robert E. Sparks
Norbert S. Mason
Assignee (at issue)
Continental White Cap, 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.