| Patents for A63B 51 - Stringing tennis rackets (1,355) |
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| 04/28/1988 | DE3636471A1 Werkzeug, insbesondere zum einsetzen von saiten in einen separate saiten aufweisenden schlaeger Tool for use of strings in a separate strings in particular having rowdy |
| 04/07/1988 | WO1988001889A3 Striking device for ball games, in particular tennis, as well as stringing device for this purpose |
| 03/29/1988 | US4733866 Portable string aligner for rackets |
| 03/24/1988 | WO1988001889A2 Striking device for ball games, in particular tennis, as well as stringing device for this purpose |
| 03/23/1988 | EP0260671A2 Racket, especially for tennis, and a device for stringing it |
| 03/22/1988 | US4732384 Racquet having centralized sweet spot |
| 03/16/1988 | EP0260208A1 Tennis racket |
| 03/16/1988 | EP0259387A1 Tool for tensioning a racket string with control of the tension |
| 03/02/1988 | EP0257627A2 Racket stringing controler |
| 03/02/1988 | EP0257424A2 Tennis string, tennis racket stringing made of it and method of making the tennis string |
| 02/25/1988 | WO1988001186A1 Arrangement for rackets |
| 01/26/1988 | US4721304 Racket string tensioning device |
| 01/13/1988 | EP0252168A1 Spacers for reducing the wear of tennis, squash and badminton racket strings, and device for inserting them |
| 01/12/1988 | CA1231353A1 Flexible grommet strip having protective grommets for rackets, especially tennis rackets |
| 12/23/1987 | DE3620624A1 Process for the production of metallised tennis-racquet strings of high durability |
| 12/17/1987 | DE3620083A1 Cross-piece for protecting the strings of a tennis racket stringing |
| 11/24/1987 | US4707977 Composite cord manufacturing method |
| 11/19/1987 | EP0137813B1 String tensioning device for use on rackets for ball games |
| 11/17/1987 | US4706955 Racket frame clamp for stringing machine |
| 11/05/1987 | DE3615123A1 Frame with stringing or the like under tensile stress |
| 10/07/1987 | EP0239985A1 Strings for sports rackets |
| 09/11/1987 | WO1987005228A1 Tool for tensioning a racket string with control of the tension |
| 09/09/1987 | EP0108093B1 Method for manufacturing racket strings, particularly for tennis rackets |
| 08/12/1987 | EP0231591A2 A tensioning device for a strung racquet |
| 08/11/1987 | US4685676 Racquet structure |
| 08/05/1987 | CN87100332A String for rackets, stringed instruments, fishing, etc. |
| 06/10/1987 | EP0225042A2 A tensioning device for a strung racquet |
| 05/05/1987 | US4662632 String tensioning device for use on rackets for ball games |
| 04/28/1987 | US4660364 Racket string construction |
| 04/07/1987 | US4655444 Holder for stringing a racket |
| 03/19/1987 | DE3532767A1 Method and device for determining the tension force of the individual strings of tensioned rackets, especially tennis rackets |
| 03/18/1987 | EP0214949A1 Protective device for the strings of a racket, in particular those of a tennis racket |
| 03/12/1987 | DE3531623A1 Stringing for a racket |
| 03/11/1987 | EP0118448B1 Improvements in mechanical seals |
| 03/04/1987 | EP0213053A1 Natural intestines provided with a protection against humidity, especially for tennis racket strings |
| 02/25/1987 | EP0211738A1 Tennis racquet |
| 01/13/1987 | CA1216606A1 Mechanical seals |
| 01/08/1987 | DE3528131A1 Double helix stringing or stringing mesh |
| 11/20/1986 | EP0201953A1 Device for varying the weight, the moment of inertia at the course of gravity of a racket |
| 11/04/1986 | US4620705 Racket stringing device |
| 10/29/1986 | CN85202723U String regulatable badminton racket |
| 10/22/1986 | EP0197969A1 Process for the preparation of cellulose film, cellulose film produced thereby, artificial skin graft and its use. |
| 09/23/1986 | US4613138 Tennis racquet with flexible membrane frame |
| 09/02/1986 | US4609194 Vibration dampening device for sporting rackets |
| 08/27/1986 | CN85108100A Process for the preparation of cellulose film, cellulose film produced thereby, artificial skin graft and its use |
| 08/13/1986 | EP0190344A1 Method and apparatus for determining tension and pressure |
| 07/30/1986 | EP0189215A2 Sports racket strings of a synthetic thermoplastic polymeric material |
| 07/02/1986 | EP0186246A1 Racket |
| 07/02/1986 | EP0106850B1 Tennis or squash racket |
| 07/01/1986 | US4597576 Sports racquet utilizing non-circular strings |
| 06/17/1986 | US4595201 Tensionable racket having unique stringing pattern |
| 06/10/1986 | US4593905 Racquet stringing system with string tension indicating means |
| 05/27/1986 | US4590808 Method and apparatus for determining tension and pressure |
| 05/22/1986 | WO1986002850A1 Method for fabricating a string for a racket, string obtained by said method and method for stringing a racket with said string |
| 05/06/1986 | US4586708 Sports racket strings of a synthetic thermoplastic polymeric material |
| 04/10/1986 | WO1986002095A1 Process for the preparation of cellulose film, cellulose film produced thereby, artificial skin graft and its use |
| 03/13/1986 | WO1986001596A1 Method and apparatus for determining tension and pressure |
| 02/04/1986 | US4568415 Winding layers of helically wound plastic sheets bands to continuoously fed core; welding under tensile stress |
| 01/28/1986 | US4566695 Game racket having adjustable string mounts |
| 01/21/1986 | US4565061 String for rackets |
| 12/27/1985 | EP0165749A2 Racquet stringing retaining standard |
| 12/19/1985 | WO1985005556A1 Vibration dampening device for sporting rackets |
| 12/03/1985 | CA1197367A1 Racket stringing device |
| 11/27/1985 | EP0162794A1 Method for measuring the tension of racket strings, and device for carrying out this method |
| 10/15/1985 | US4546977 Racquet stringing machine with improved racquet retaining standard |
| 10/02/1985 | EP0156599A1 Composite carbon fibre and thermoplastic fiber blends |
| 09/03/1985 | US4538821 Mechanical seals |
| 08/14/1985 | EP0151137A1 Racket for a ball game, particularly tennis |
| 07/23/1985 | US4530206 Strings for tennis rackets and rackets equipped with same |
| 07/17/1985 | EP0148793A2 Sports racket strings of a synthetic thermoplastic polymeric material |
| 07/17/1985 | EP0148713A2 Two-clamps machine for stringing tennis rackets and the like |
| 05/21/1985 | CA1187522A1 Muscle-building apparatus for developing bending strength |
| 04/24/1985 | EP0137813A1 String tensioning device for use on rackets for ball games. |
| 04/23/1985 | US4512576 Strung racket and tension adjusting device therefor |
| 04/23/1985 | US4512575 Racquet having strings of equal length |
| 04/03/1985 | EP0136245A2 Apparatus for stringing rackets |
| 02/13/1985 | EP0133165A2 Racquet with string clamping means |
| 02/13/1985 | EP0132993A1 A racquet |
| 02/12/1985 | US4499144 Pliable, moisture resistant racket string |
| 01/22/1985 | US4494752 Racket stringer and tensioner |
| 01/17/1985 | WO1985000114A1 Racket for a ball game, particularly tennis |
| 01/09/1985 | EP0130622A1 Flexible stringer strip with string-protecting sleeves for rackets, especially tennis rackets |
| 01/01/1985 | US4491322 Tensioning apparatus for a racket-stringing machine |
| 12/25/1984 | US4489942 Tennis racket and string aligner therefor |
| 12/18/1984 | US4488722 Safety tennis racquet |
| 11/27/1984 | US4484742 Stringing tool for tennis rackets and the like |
| 11/21/1984 | EP0125953A1 Method of making a cord of several components |
| 10/10/1984 | EP0120924A1 Method and apparatus for stringing a racquet |
| 09/19/1984 | EP0118448A1 Improvements in mechanical seals. |
| 08/30/1984 | WO1984003221A1 String tensioning device for use on rackets for ball games |
| 07/31/1984 | US4462591 Racket string filament |
| 07/10/1984 | US4458898 Racquet with string positioning elements |
| 06/27/1984 | EP0024079B1 String pre-stretching apparatus and method for racket-stringing machine |
| 06/26/1984 | US4456254 Apparatus for stringing a racquet |
| 06/19/1984 | US4455021 Method of stringing or restringing a tennis racket |
| 06/05/1984 | US4452452 Apparatus for stringing a racket frame |
| 05/23/1984 | EP0109087A1 Tensioning arrangement |
| 05/22/1984 | US4449353 Gut string for sports rackets |
| 05/02/1984 | EP0106850A1 Tennis or squash racket. |
| 04/12/1984 | WO1984001304A1 Method and apparatus for stringing a racquet |