US4196901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tennis racquet
Assignee: Individual
•
Filing: 1977-03-07
•
Granted: 1980-04-08
•
Expires: 1997-03-07
Abstract
Abstract A tennis racquet comprising a frame providing an open, tensioned string receiving, playing head of generally elliptical contour, and an elongated handle extending from one end of the head and terminating in a hand grip, the contour of the open head at the hand grip end thereof being closed at a point between the center of gravity and the hand grip end of said racquet. A preferred form of the racquet comprises a unitary frame bowed in its central portion to form a generally elliptical head contour and continuing as coplanar throat and shaft extensions which are joined at their extremeties in a hand grip, and the first joining of the ends being at a point between the center of gravity and the hand grip end of the racquet. Central longitudinal strings may join the frame at points closer to the hand grip end than is the center of gravity, and the longitudinal strings are under somewhat greater tension than the transverse strings. The racquet is characterized by reduced weight in the throat portion, resulting in the percussion center of the stringed area being significantly advanced toward the tip end of the racquet, and the vibration level being reduced.
Inventors
- 👤 Enoch J. Durbin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:24
CPC Classifications
A; A63; A63B; A63B49/00; A63B49/02; A63B49/03; A63B51/00; A63B51/004; A63B60/00; A63B60/06; A63B60/14; A63B2049/0207; A63B2049/0212; A63B60/54
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
129 words
A tennis racquet comprising a frame bowed to form a generally elliptical playing head portion joined to elongated extensions including throat portions and shaft portions, said shaft and throat portions being spaced apart and joined only at the extremeties of said shaft portions by a hand grip having a length which is less than 40% of the overall racquet length, and interlaced transverse and longitudinal strings providing a resilient impact member throughout said head portion and the space between said throat and shaft portions of said frame, said tennis racquet being characterized in that the percussion center of said racquet is uniquely advanced toward the tip end of the racquet and the vibration level is reduced by reason of the reduced mass in the throat portion of said racquet.
Claim 2
Dependent Claim
129 words
A tennis racquet comprising a frame bowed to form a generally elliptical playing head portion joined to elongated extensions including throat portions and shaft portions, said shaft and throat portions being spaced apart and joined only at the extremeties of said shaft portions by a hand grip having a length which is less than 40% of the overall racquet length, and interlaced transverse and longitudinal strings providing a resilient impact member throughout said head portion and the space between said throat and shaft portions of said frame, said tennis racquet being characterized in that the percussion center of said racquet is uniquely advanced toward the tip end of the racquet and the vibration level is reduced by reason of the reduced mass in the throat portion of said racquet.
Claim 3
Dependent Claim
37 words
A tennis racquet as defined in claim 1, wherein the tension in said longitudinal strings is greater than the tension in said transverse strings to thereby enhance the transverse stiffness in the throat portion of said racquet.
Claim 4
Dependent Claim
28 words
A tennis racquet as defined in claim 2, wherein the tension in said longitudinal strings is about 5% to 25% greater than the tension in said transverse strings.
Claim 5
Dependent Claim
27 words
A tennis racquet as defined in claim 1, wherein said shaft and throat portions of said frame have reverse curved contours in joining said generally elliptical portion.
Claim 6
Dependent Claim
27 words
A tennis racquet as defined in claim 1, wherein said shaft and throat portions of said frame are essentially colinear and tangentially join said generally elliptical portion.
Claim 7
Dependent Claim
151 words
A tennis racquet comprising a frame bowed to form a generally elliptical playing head portion joined to elongated extensions including throat portions and shaft portions, said shaft and throat portions being spaced apart and joined at the extremeties of said shaft portions in a hand grip having a length which is less than 40% of the overall racquet length, spacer means secured between said elongated extensions in spaced relation to said hand grip, said spacer means weighing less than one ounce and completing a playing head portion of said racquet, and interlaced transverse and longitudinal strings providing a resilient impact member throughout said playing head portion of the racquet, said tennis racquet being characterized in that the percussion center of said racquet is uniquely advanced toward the tip end of the racquet and the vibration level is reduced by reason of the reduced mass in the throat portion of said racquet.
Claim 8
Dependent Claim
151 words
A tennis racquet comprising a frame bowed to form a generally elliptical playing head portion joined to elongated extensions including throat portions and shaft portions, said shaft and throat portions being spaced apart and joined at the extremeties of said shaft portions in a hand grip having a length which is less than 40% of the overall racquet length, spacer means secured between said elongated extensions in spaced relation to said hand grip, said spacer means weighing less than one ounce and completing a playing head portion of said racquet, and interlaced transverse and longitudinal strings providing a resilient impact member throughout said playing head portion of the racquet, said tennis racquet being characterized in that the percussion center of said racquet is uniquely advanced toward the tip end of the racquet and the vibration level is reduced by reason of the reduced mass in the throat portion of said racquet.
Claim 9
Dependent Claim
34 words
A tennis racquet as defined in claim 6, wherein the location of said spacer means is such as to provide a playing head which is assymetrically extended in the direction of said hand grip.
Claim 10
Dependent Claim
37 words
A tennis racquet as defined in claim 7, wherein the tension in said longitudinal strings is greater than the tension in said transverse strings to thereby enhance the transverse stiffness in the throat portion of said racquet.
Claim 11
Dependent Claim
28 words
A tennis racquet as defined in claim 8, wherein the tension in said longitudinal strings is about 5% to 25% greater than the tension in said transverse strings.
Claim 12
Dependent Claim
26 words
A tennis racquet as defined in claim 6, wherein said spacer means is located between the center of gravity of the racquet and said hand grip.
Claim 13
Dependent Claim
26 words
A tennis racquet as defined in claim 6, wherein portions of said extensions between said spacer means and generally elliptical portion are of reverse curved contour.
Claim 14
Dependent Claim
30 words
A tennis racquet as defined in claim 6, wherein portions of said extensions between said spacer means and generally elliptical portion are essentially straight and tangentially join said elliptical portion.
Claim 15
Dependent Claim
47 words
A tennis racquet as defined in claim 6, wherein said spacer means includes spaced portions extending along said extensions in the direction of the racquet head, said spaced portions having means for guiding and spacing the central longitudinal strings at the points of attachment to said frame.
References Cited (Backward Citations)
GB190414798A
Cited
US1539019A
Cited
GB267837A
Cited
GB284754A
Cited
US1862581A
Cited
US1930285A
Cited
US2132780A
Cited
US2164631A
Cited
US2206548A
Cited
US2311172A
Cited
FR1495578A
Cited
US3702701A
Cited
US3801099A
Cited
US3913911A
Cited
US3999756A
Cited
US3999756B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-08 | 1983-10-08 | 1984-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-08 | 1987-10-08 | 1988-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-08 | 1991-10-08 | 1992-04-08 | $7700.00 | Window Closed / Lapsed |