Granted Patent
Utility
US 5,225,078 · App. 07/845,690
Pour-through pitcher filter
Inventors:
Ralph A. Polasky, Vue X. Yang
Patented Case
View Patent ↗
Granted: Jul 6, 1993
Filed: Mar 4, 1992
Inventors
Ralph A. Polasky
Vue X. Yang
Assignee (at issue)
Ametek, Inc., Plymouth Products Division
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.