Granted Patent
Utility
US 6,221,462 · App. 08/390,175
Multicolored patterned floor covering and method for manufacture
Inventors:
Gerhard Graab, Klaus Heckel, Dieter Rischer, Thorsten Nahe, Helmut Grunhag
Patented Case
View Patent ↗
Granted: Apr 24, 2001
Filed: Feb 17, 1995
Inventors
Gerhard Graab
Klaus Heckel
Dieter Rischer
Thorsten Nahe
Helmut Grunhag
Assignee (at issue)
Firma Carl Freudenberg
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.