US3752478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Racket frame
Assignee: Q HOLDINGS CORP
•
Filing: 1971-03-26
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Granted: 1973-08-14
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Expires: 1991-03-26
Abstract
Abstract A tennis or the like game racket having a frame of extruded aluminum provided with a tri-hollow cross-section enabling the frame to be reduced in weight without detracting from the strength of the frame.
Inventors
- 👤 P Flak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:11
CPC Classifications
A; A63; A63B; A63B49/00; A63B49/02; A63B49/12; A63B60/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
144 words
A game racket frame including a string receiving bow section and an integral handle receiving section, said frame comprising a hollow elongated seamless extruded unit, said unit having a cross section comprising tubular edge sections, spaced inner and outer webs connected between and integral with said tubular edge sections, and a pair of spaced longitudinal ribs, each of said ribs being connected between said inner and outer webs, said longitudinal ribs being disposed on opposite sides of the longitudinal axis of said extruded unit so as to form a central hollow box and two hollow edge sections within said extruded unit; the inner surface ofeach of said ribs having a geometrical configuration such that said inner surfaces converge toward each other so as to provide guiding and centering surfaces adapted to guide a drill for drilling string openings through said webs between said ribs.
Claim 2
Dependent Claim
144 words
A game racket frame including a string receiving bow section and an integral handle receiving section, said frame comprising a hollow elongated seamless extruded unit, said unit having a cross section comprising tubular edge sections, spaced inner and outer webs connected between and integral with said tubular edge sections, and a pair of spaced longitudinal ribs, each of said ribs being connected between said inner and outer webs, said longitudinal ribs being disposed on opposite sides of the longitudinal axis of said extruded unit so as to form a central hollow box and two hollow edge sections within said extruded unit; the inner surface ofeach of said ribs having a geometrical configuration such that said inner surfaces converge toward each other so as to provide guiding and centering surfaces adapted to guide a drill for drilling string openings through said webs between said ribs.
Claim 3
Dependent Claim
24 words
The invention as defined in claim 1 wherein said outer web is recessed in the unit to provide a straight walled string proTecting channel.
Claim 4
Dependent Claim
124 words
A game racket frame including a string receiving bow section and an integral handle receiving section, said frame comprising a hollow elongated seamless extruded unit, said unit having a cross section comprising tubular edge sections, spaced inner and outer webs connected between and integral with said tubular edge sections, and a pair of spaced longitudinal ribs, each of said ribs being connected between said inner and outer webs, said longitudinal ribs being disposed on opposite sides of the longitudinal axis of said extruded unit so as to form a central hollow box and two hollow edge sections within said extruded unit; the portions of the unit forming an outer wall of the tubular edge sections being thicker than the webs and the longitudinal ribs.
Claim 5
Dependent Claim
124 words
A game racket frame including a string receiving bow section and an integral handle receiving section, said frame comprising a hollow elongated seamless extruded unit, said unit having a cross section comprising tubular edge sections, spaced inner and outer webs connected between and integral with said tubular edge sections, and a pair of spaced longitudinal ribs, each of said ribs being connected between said inner and outer webs, said longitudinal ribs being disposed on opposite sides of the longitudinal axis of said extruded unit so as to form a central hollow box and two hollow edge sections within said extruded unit; the portions of the unit forming an outer wall of the tubular edge sections being thicker than the webs and the longitudinal ribs.
References Cited (Backward Citations)
US1588140A
Cited
US1937787A
Cited
US2668682A
Cited
US2742289A
Cited
US3540728A
Cited
US3625512A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |