US4989871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Badmington racquet structure
Assignee: Individual
•
Filing: 1990-05-02
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Granted: 1991-02-05
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Expires: 2010-05-02
Abstract
Abstract The present invention relates to an improved racquet structure. More particularly, it relates to an improved badminton racquet structure of greater integrity and rigidity and that, moreover, can be manufactured with greater efficiency. The improved badminton racquet structure comprises a head frame with hitting net strung over it, a hollow T-shaped connector rigidly attached to the head frame on one side, a handle with a co-axial internal cavity, a connecting tube placed between and extending into the interval cavity and hollow of the T-shaped connector, and two rigid retaining elements positioned at the opposite ends of the connecting tube, which are seated in two retaining flares formed on the opposite ends of the connecting tube.
Inventors
- 👤 Chang C. Sheng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:51
CPC Classifications
A; A63; A63B; A63B49/00; A63B49/02; A63B49/03; A63B49/032; A63B49/08; A63B60/00; A63B60/06; A63B60/08; A63B60/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
170 words
An improved badminton racquet structure comprising; a head frame of substantially oval shape, said head frame threaded through in a criss-crossing fashion forming a net surface within said head frame; a T-shaped connector disposed on one side of said head frame along its major axis, said T-shaped connector being hollow; a handle with an internal receiving cavity co-axial with said handle; a connecting tube disposed to a maximum extent, on either end of said connecting tube, within said receiving cavity and said T-shaped connector; said connecting tube being co-axial with said handle and major axis of said head frame; two rigid retaining elements, one each of said rigid retaining elements disposed at the rearmost space in said receiving cavity and at the frontmost space inside of said T-shaped connector, said retaining elements being co-axial with said receiving cavity and said T-shaped connector; and two outward retaining flares formed at the opposite ends of said connecting tube, forming a sturdy connection between said connecting tube and said handle and head frame.
Claim 2
Dependent Claim
170 words
An improved badminton racquet structure comprising; a head frame of substantially oval shape, said head frame threaded through in a criss-crossing fashion forming a net surface within said head frame; a T-shaped connector disposed on one side of said head frame along its major axis, said T-shaped connector being hollow; a handle with an internal receiving cavity co-axial with said handle; a connecting tube disposed to a maximum extent, on either end of said connecting tube, within said receiving cavity and said T-shaped connector; said connecting tube being co-axial with said handle and major axis of said head frame; two rigid retaining elements, one each of said rigid retaining elements disposed at the rearmost space in said receiving cavity and at the frontmost space inside of said T-shaped connector, said retaining elements being co-axial with said receiving cavity and said T-shaped connector; and two outward retaining flares formed at the opposite ends of said connecting tube, forming a sturdy connection between said connecting tube and said handle and head frame.
Claim 3
Dependent Claim
19 words
An improved badminton racquet structure as in claim (1) with said rigid retaining elements of a substantially cone shape.
Claim 4
Dependent Claim
38 words
An improved badminton racquet structure as in claim (1) with said handle comprising said internal receiving cavity with an inner sleeve, said inner sleeve having an inside diameter substantially equal to the outside diameter of said connecting tube.
References Cited (Backward Citations)
US2395864A
Cited
GB1209277A
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GB1446306A
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GB2026327A
Cited
GB2037168A
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US4575084A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-04 | 1994-08-06 | 1995-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-04 | 1998-08-06 | 1999-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-04 | 2002-08-06 | 2003-02-05 | $7700.00 | Window Closed / Lapsed |