Granted Patent
Utility
US 4,549,828 · App. 06/554,141
Writing instrument with separable compensating means
Inventors:
Gerold Anderka, Rolf Tenhagen
Patented Case
View Patent ↗
Granted: Oct 29, 1985
Filed: Nov 21, 1983
Inventors
Gerold Anderka
Rolf Tenhagen
Assignee (at issue)
rotring-werke Riepe KG
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.