US4299348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a game racket
Assignee: Mansei Kogyo KK
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Filing: 1980-01-23
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Granted: 1981-11-10
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Expires: 2000-01-23
Abstract
Abstract A game racket includes a generally oval head section and a handle section extending from the head section. A plastic brace is secured in the head section to complete the ovality of the head section. A hand grip is fixed to the handle section. The head section and the handle section are constituted by a tubular titanium strip which is provided with a Vickers hardness of 150 to 220.
Inventors
- 👤 Katsumi Fukumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:04
CPC Classifications
A; A63; A63B; A63B49/00; A63B49/02; A63B49/12; A63B60/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49616
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
143 words
A method of making a frame strip for a game racket having a generally oval head, a throat, a handle portion and a grip at the end of said handle portion, comprising the steps of: forming a first circular hollow tube by welding together the opposed edges of a plate-like strip of titanium material; drawing said first circular hollow tube to form a second circular hollow tube of reduced diameter; further drawing said second circular hollow tube into a bone-shaped frame strip with a pair of arcuate sections connected by spaced web sections, in such a manner as said weld lies longitudinally on and along one of said arcuate sections; providing said frame strip with a vickers hardness in the range of 150 to 220; and bending said frame strip into an oval shape to form said generally oval head of the racket.
Claim 2
Independent Claim
143 words
A method of making a frame strip for a game racket having a generally oval head, a throat, a handle portion and a grip at the end of said handle portion, comprising the steps of: forming a first circular hollow tube by welding together the opposed edges of a plate-like strip of titanium material; drawing said first circular hollow tube to form a second circular hollow tube of reduced diameter; further drawing said second circular hollow tube into a bone-shaped frame strip with a pair of arcuate sections connected by spaced web sections, in such a manner as said weld lies longitudinally on and along one of said arcuate sections; providing said frame strip with a vickers hardness in the range of 150 to 220; and bending said frame strip into an oval shape to form said generally oval head of the racket.
Claim 3
Dependent Claim
25 words
The method of claim 1 in which said weld is arranged to extend on and along the longitudinal center-line of one of said arcuate sections.
Claim 4
Dependent Claim
24 words
The method of claim 1 in which said first circular hollow tube is annealed before being drawn to form said second circular hollow tube.
Claim 5
Dependent Claim
37 words
The method of claim 1 in which said second circular hollow tube is drawn to form said bone-shaped frame strip which is provided with a spacing, said spacing being less than 1 mm between said web sections.
Claim 6
Dependent Claim
54 words
The method of claim 1 in which said first welded circular hollow tube is made from said plate-like titanium material having a weight of about 260 G and a thickness of 0.6 mm, and wherein said first welded circular hollow tube is translated into said bone-shaped frame strip by means of said drawing process.
Claim 7
Dependent Claim
38 words
The method of claim 1 in which after said bone-shaped frame strip has been bent to form said generally oval head of the racket, the surface of said frame strip is finished by means of a sandblast treatment.
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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) | 1984-11-09 | 1985-05-11 | 1985-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-09 | 1989-05-11 | 1989-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-09 | 1993-05-11 | 1993-11-10 | $7700.00 | Window Closed / Lapsed |