Patent DE890116C successfully refreshed from Google Patents.
Patent US4141551A successfully refreshed from Google Patents.
US4141551A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Racket
Assignee: Individual
•
Filing: 1977-04-01
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Granted: 1979-02-27
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Expires: 1997-04-01
Abstract
Abstract Tennis racket with the racket head built up by crossing strings fastened to a frame, one set of which strings runs substantially in the longitudinal direction of the racket head and a second set of which runs substantially in the transverse direction thereof. In order to reduce the effect of unclean hits the active length of at least the longitudinal strings of a longitudinal center portion of the racket head is greater the farther away from the longitudinal center line of the racket head they are placed.
Inventors
- 👤 Gunnar P. M. Goransson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:05
CPC Classifications
A; A63; A63B; A63B49/00; A63B49/02; A63B49/03
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
204 words
In a game racket including a racket head comprising an open, substantially oval frame member, a first set of strings strung to the frame member and running substantially in the longitudinal direction of the racket head, and a second set of strings strung to the frame member and running substantially in the transverse direction of the racket head across the longitudinal strings, the improvement characterized by: means embodied in the frame member for mounting one end of each of a plurality of adjacent ones of the longitudinal strings of the first set in a center portion of the racket head in such a manner that they have free and laterally unrestrained active lengths which successively increase the farther away they are displaced from the longitudinal center line of the racket head, said mounting means having a plurality of spaced through bores for receiving said plurality of adjacent longitudinal strings, the diameter of said bores being sufficiently larger than the diameter of said strings to permit the strings to run substantially unobstructedly therethrough, whereby such successively increasing active lengths compensate for the decreasing active lengths of the transverse strings as they approach the handle end of the racket head, thereby providing an enlarged sweet spot.
Claim 2
Dependent Claim
204 words
In a game racket including a racket head comprising an open, substantially oval frame member, a first set of strings strung to the frame member and running substantially in the longitudinal direction of the racket head, and a second set of strings strung to the frame member and running substantially in the transverse direction of the racket head across the longitudinal strings, the improvement characterized by: means embodied in the frame member for mounting one end of each of a plurality of adjacent ones of the longitudinal strings of the first set in a center portion of the racket head in such a manner that they have free and laterally unrestrained active lengths which successively increase the farther away they are displaced from the longitudinal center line of the racket head, said mounting means having a plurality of spaced through bores for receiving said plurality of adjacent longitudinal strings, the diameter of said bores being sufficiently larger than the diameter of said strings to permit the strings to run substantially unobstructedly therethrough, whereby such successively increasing active lengths compensate for the decreasing active lengths of the transverse strings as they approach the handle end of the racket head, thereby providing an enlarged sweet spot.
Claim 3
Dependent Claim
79 words
A game racket as defined in claim 1, wherein: (a) the mounting means includes a throat piece adjacent a handle end of the racket head, (b) the ends of the longitudinal strings of the center portion are fastened to the throat piece, and (c) the throat piece is shaped to implement the successive increases in the active lengths of the longitudinal strings of the center portion the greater their distance from the longitudinal center line of the racket head.
Claim 4
Dependent Claim
18 words
A game racket as defined in claim 2, wherein said through bores are provided in the throat piece.
Claim 5
Dependent Claim
28 words
A game racket as defined in claim 3, wherein the throat piece has an inverted V-shape at its surface at which the ends of the longitudinal strings lie.
Claim 6
Dependent Claim
35 words
A game racket as defined in claim 4, wherein the second set of strings terminate short of the throat piece to leave the lower portion of the longitudinal strings free from any transverse crossing strings.
Claim 7
Dependent Claim
35 words
A game racket as defined in claim 3, wherein the second set of strings terminate short of the throat piece to leave the lower portion of the longitudinal strings free from any transverse crossing strings.
Claim 8
Dependent Claim
28 words
A game racket as defined in claim 2, wherein the throat piece has an inverted V-shape at its surface at which the ends of the longitudinal strings lie.
Claim 9
Dependent Claim
35 words
A game racket as defined in claim 7, wherein the second set of strings terminate short of the throat piece to leave the lower portion of the longitudinal strings free from any transverse crossing strings.
Claim 10
Dependent Claim
35 words
A game racket as defined in claim 2, wherein the second set of strings terminate short of the throat piece to leave the lower portion of the longitudinal strings free from any transverse crossing strings.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-26 | 1982-08-28 | 1983-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-26 | 1986-08-28 | 1987-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-26 | 1990-08-28 | 1991-02-27 | $7700.00 | Window Closed / Lapsed |