Granted Patent
Utility
US 5,129,656 · App. 07/735,511
Racquet, in particular a tennis racquet
Inventors:
Robert Marte, Helmut Umlauft
Patented Case
View Patent ↗
Granted: Jul 14, 1992
Filed: Jul 26, 1991
Inventors
Robert Marte
Helmut Umlauft
Assignee (at issue)
Head Sportgerate Gesellschaft m.b.H. & Co. OHG
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.