Granted Patent
Utility
US 4,337,601 · App. 06/143,496
High-strength light-weight boom section for telescopic crane boom
Inventors:
Lembit Vaerk, Narahari Gattu
Patented Case
View Patent ↗
Granted: Jul 6, 1982
Filed: Apr 24, 1980
Inventors
Lembit Vaerk
Narahari Gattu
Assignee (at issue)
Harnischfeger 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.