Granted Patent
Utility
US 5,879,109 · App. 08/021,272
Process and apparatus for introducing an optical or electrical cable into solid ground
Inventors:
Lothar Finzel, Heinz Diermeier, Peter Dotzer, Ernst Mayr
Patented Case
View Patent ↗
Granted: Mar 9, 1999
Filed: Feb 10, 1998
Inventors
Lothar Finzel
Heinz Diermeier
Peter Dotzer
Ernst Mayr
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.