Granted Patent
Utility
US 6,214,135 · App. 09/295,873
Entry board for drilling small holes, a method of making the same and a method for drilling small holes through a printed circuit board by using said entry board
Inventors:
Yasushi Washio, Koji Miyano, Akio Fukuda
Patented Case
View Patent ↗
Granted: Apr 10, 2001
Filed: Apr 21, 1999
Inventors
Yasushi Washio
Koji Miyano
Akio Fukuda
Assignee (at issue)
Showa Aluminum Corp.
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.