IP Library › Granted Patent US 4,776,592
Granted Patent Utility
US 4,776,592 · App. 06/883,787

Device for the protection of the strings of a ball racket, particularly tennis racket

Inventors: Helmut Umlauft, Karl-Heinz Wager
Patented Case View Patent ↗
Granted: Oct 11, 1988 Filed: Jul 9, 1986
Inventors
Helmut Umlauft
Karl-Heinz Wager
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.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 4,776,592
App. No.
06/883,787
Filed
1986-07-09
Granted
1988-10-11
Kind
A