Granted Patent
Utility
US 6,428,554 · App. 09/629,297
Dual action tongue scraper
Inventors:
Kenneth Rosenblood, Robert Hayman
Patented Case
View Patent ↗
Granted: Aug 6, 2002
Filed: Jul 31, 2000
Inventors
Kenneth Rosenblood
Robert Hayman
Assignee (at issue)
DISCUS DENTAL IMPRESSIONS, LLC
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.