Granted Patent
Utility
US 4,644,130 · App. 06/735,276
Method for creating blind holes in a laminated structure
Inventor:
Friedrich Bachmann
Patented Case
View Patent ↗
Granted: Feb 17, 1987
Filed: May 17, 1985
Inventor
Friedrich Bachmann
Assignee (at issue)
Siemens Aktiengesellschaft
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.