Granted Patent
Utility
US 6,701,768 · App. 10/161,254
Process for making ratchet wheels
Inventors:
David Ling, Hsien-Chung Tuan-Mu
Patented Case
View Patent ↗
Granted: Mar 9, 2004
Filed: May 31, 2002
Inventors
David Ling
Hsien-Chung Tuan-Mu
Assignee (at issue)
Hand Tool Design Corporation
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.