Patent US4360202A successfully refreshed from Google Patents.
US4360202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
CFRP or FRP made badminton racket frame
Assignee: Individual
•
Filing: 1980-05-22
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Granted: 1982-11-23
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Expires: 2000-05-22
Abstract
Abstract A badminton racket frame comprising a ring frame, a throat, a shaft and a grip wherein said parts of the racket frame further comprising a layer made of carbon fiber reinforced plastics or fiber reinforced plastics having been soaked in a high polymer epoxy resin to form a prepreg sheet, and a solid independent foaming material as the core thereof. The present badminton racket frame is hot-pressing molded and has a shaft with the foaming material core therein having a diameter around one millimeter.
Inventors
- 👤 Kun-Nan Lo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:27
CPC Classifications
A; A63; A63B; A63B49/00; A63B49/02; A63B49/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A badminton racket frame comprising: a closed ring frame including a solid ring of foamed material and an outer jacket of fiber reinforced plastic, said outer jacket completely jacketing said ring; a shaft having a diameter of approximately one millimeter, said shaft including a solid rod of foamed material and an outer jacket of fiber reinforced plastic; a throat portion where said shaft is butted against and connected to the outer jacket of said ring frame in coplanar relationship and forms a seamless connection therewith; and a grip attached to said shaft; whereby said racket frame has a fiber reinforced plastic outer layer and a solid independent foamed material as the core thereof, said layer and core being closely and tightly constructed to form a seamless racket frame.
Claim 2
Dependent Claim
128 words
A badminton racket frame comprising: a closed ring frame including a solid ring of foamed material and an outer jacket of fiber reinforced plastic, said outer jacket completely jacketing said ring; a shaft having a diameter of approximately one millimeter, said shaft including a solid rod of foamed material and an outer jacket of fiber reinforced plastic; a throat portion where said shaft is butted against and connected to the outer jacket of said ring frame in coplanar relationship and forms a seamless connection therewith; and a grip attached to said shaft; whereby said racket frame has a fiber reinforced plastic outer layer and a solid independent foamed material as the core thereof, said layer and core being closely and tightly constructed to form a seamless racket frame.
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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) | 1985-11-22 | 1986-05-24 | 1986-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-22 | 1990-05-24 | 1990-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-22 | 1994-05-24 | 1994-11-23 | $7700.00 | Window Closed / Lapsed |