Granted Patent
Utility
US 6,552,857 · App. 10/126,695
Soft-focus lens system
Inventor:
Takayuki Sensui
Patented Case
View Patent ↗
Granted: Apr 22, 2003
Filed: Apr 23, 2002
Inventor
Takayuki Sensui
Assignee (at issue)
Pentax 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.