US5071124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Badminton racquet
Assignee: NORDICA USA Inc
•
Filing: 1990-05-03
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Granted: 1991-12-10
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Expires: 2010-05-03
Abstract
Abstract A badminton racquet includes a head, a shaft, and a Y-joint connecting the head to the shaft. The Y-joint geometry offers improved transmission of stress from the head to the shaft, and the resulting increased length of the center longitudinal strings improves power. Preferably, the frame has an improved aerodynamic profile, and a kick shaft to produce greater head speed at the point of impact.
Inventors
- 👤 Stephen J. Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:57
CPC Classifications
A; A63; A63B; A63B49/00; A63B49/02; A63B49/022; A63B2049/0201; A63B2049/0203; A63B2049/0204; A63B2049/0207; A63B2049/0211; A63B2049/0212; A63B2049/0217
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
105 words
A badminton racquet including a frame having a head, a shaft, and a Y-joint composed of a pair of arms and a stem that joins the head portion to the shaft portion, wherein the head includes an outer tip region, wherein the height of the head frame cross-section in a direction perpendicular to a string plane is greatest in the tip region and the width of the head frame cross-section within a plane of the stringing is smallest; wherein the height is greater than the width in the tip region; and wherein, in a direction toward the Y-joint, the height decreases and the width increases.
Claim 2
Dependent Claim
105 words
A badminton racquet including a frame having a head, a shaft, and a Y-joint composed of a pair of arms and a stem that joins the head portion to the shaft portion, wherein the head includes an outer tip region, wherein the height of the head frame cross-section in a direction perpendicular to a string plane is greatest in the tip region and the width of the head frame cross-section within a plane of the stringing is smallest; wherein the height is greater than the width in the tip region; and wherein, in a direction toward the Y-joint, the height decreases and the width increases.
Claim 3
Dependent Claim
45 words
A badminton racquet as defined in claim 1, wherein the angle between the arms is in the range of approximately 90 to 160 degrees, and wherein the head includes a pair of opposed legs that extend outwardly from the Y-joint generally linearly for a distance.
Claim 4
Dependent Claim
34 words
A badminton racquet as defined in claim 2, wherein the opposed legs extend generally linearly approximately 70 percent of the total width of the head, and then bend to a region of maximum width.
Claim 5
Dependent Claim
29 words
A badminton racquet as defined in claim 1, wherein the height decreases linearly, as a function of position along the frame axis, from the tip region to the Y-joint.
Claim 6
Dependent Claim
31 words
A badminton racquet as defined in claim 4, wherein the width of the head increases, as a function of position along the frame axis, from the tip region to the Y-joint.
Claim 7
Dependent Claim
34 words
A badminton racquet as defined in claim 1, comprising a handle mounted on an end region of the shaft, wherein the shaft includes a relatively flexible region lying between the handle and the Y-joint.
Claim 8
Dependent Claim
29 words
A badminton racquet as defined in claim 6, wherein the shaft has a height which is smallest in the flexible region, and which increases toward the handle and Y-joint.
Claim 9
Dependent Claim
24 words
A badminton racquet as defined in claim 1, wherein the height increases and the width decreases continuously from the tip region to the Y-joint.
References Cited (Backward Citations)
DE605166C
Cited
US3647211A
Cited
US4165071A
Cited
US4145047A
Cited
GB2026327A
Cited
US4280699A
Cited
US4664380A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-09 | 1995-06-10 | 1995-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-09 | 1999-06-10 | 1999-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-09 | 2003-06-10 | 2003-12-10 | $7700.00 | Window Closed / Lapsed |