Sports racquet with string port holes

Details Sports racquet with string port holes Sports racquet with string port holes

2011-05-03

2011-05-03

Johnson, Christina (Department: 1742)

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Making hole or aperture in article

C264S138000, C264S258000

Reexamination Certificate

active

07935286

ABSTRACT:
A sports racquet having a plurality of string port holes and conventional string holes is formed of a single tube of prepreg material. When molded, mold elements press opposed portions of the prepreg tube into contact with one another, and shape the adjoining prepreg material into a string port hole blanks. The portion of the pressed-together material which initially blocks the string port hole is removed after molding so that the string port holes extend through the frame. Alternatively, the mold elements cause the prepreg tube to follow a serpentine shape, thereby defining string port holes which are open alternately along the top and bottom surface of the frame. A pair of cover rings may be secured to the top and bottom racquet surfaces to cover the open sides of the string port holes.

REFERENCES:
patent: 4183776 (1980-01-01), Staub et al.
patent: 5234657 (1993-08-01), Hong
patent: 2005/0153799 (2005-07-01), Rigoli
patent: 2005/0266940 (2005-12-01), Filippini
patent: 3922701 (1991-01-01), None
patent: 19854737 (1999-09-01), None
patent: WO94/26361 (1994-05-01), None
patent: WO2004/075996 (2004-09-01), None
patent: WO2004075996 (2004-09-01), None
European Patent Office, Extended European Search Report for EP05112160.6, Jul. 13, 2006.

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