Granted Patent
Utility
US 4,950,434 · App. 07/011,396
Arrangement for the production of longitudinal screed slabs consisting of concrete
Inventors:
Stig-åke Ljungkvist, Lennart Johansson
Patented Case
View Patent ↗
Granted: Aug 21, 1990
Filed: Feb 5, 1987
Inventors
Stig-åke Ljungkvist
Lennart Johansson
Assignee (at issue)
Permaban Southeast, Inc.
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.