Granted Patent
Utility
US 5,238,329 · App. 07/928,496
Mine roof support system
Inventors:
Lawrence E. Long, Klaus M. Langeneckert, Gero Herrmann
Patented Case
View Patent ↗
Granted: Aug 24, 1993
Filed: Aug 11, 1992
Inventors
Lawrence E. Long
Klaus M. Langeneckert
Gero Herrmann
Assignee (at issue)
Dyckeroff & Widmann AG of Munich
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.