Granted Patent
Utility
US 6,139,533 · App. 09/487,185
Hypodermic needle capping device
Inventors:
Frank Zhishi Xia, Gunther Maier, Jack Yongfeng Zhang, Mary Ziping Luo
Patented Case
View Patent ↗
Granted: Oct 31, 2000
Filed: Jan 19, 2000
Inventors
Frank Zhishi Xia
Gunther Maier
Jack Yongfeng Zhang
Mary Ziping Luo
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.