Patent US3892831A successfully refreshed from Google Patents.
US3892831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacture of tennis rackets of reinforced synthetic material
Assignee: Individual
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Filing: 1973-05-11
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Granted: 1975-07-01
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Expires: 1993-05-11
Abstract
Abstract A tennis racket frame is formed in a mold from superposed tubes of reinforced synthetic materials covered with woven layers of glass fiber and the like impregnated with a polymerizable synthetic material. The tubes are inflated in the mold and the material polymerized. The layers are disposed to form reinforced webs between them and to band the tubes together. The tubes may be disposed about the heart of the racket and the hoop in various ways to resist the forces at the junction of the hoop and handle of the racket frame.
Inventors
- 👤 Jacques Andre Robin
- 👤 Michel Roger Guyot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:07
CPC Classifications
B; B29; B29D; B29D24/00; B29D24/002; B29D24/008; A; A63; A63B; A63B49/00; A63B49/02; A63B49/10; A63B49/11; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/16; B29C70/22; B29C70/222; A63B2209/00; A63B2209/02; A63B2209/023; B29C43/00; B29C43/02; B29C43/10; B29C43/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
182 words
PROCESS FOR THE MANUFACTURE OF TENNIS RACKET FRAMES FROM WOVEN TUBULAR SHEATHS OF FILAMENTARY SYNTHETIC REINFORCED MATERIAL IMPREGNATED WITH A POLYMERIZED SYNTHETIC MATERIAL, THE STEPS OF PLACING AT LEAST TWO SUPERPOSED INFLATABLE SHEATHS HAVING LONG AXES IN CONTACT WITH THEIR LONG AXES PARALLEL, CONNECTING THE SUPERPOSED SHEATHS TO EACH OTHER AND FORMING BETWEEN THEM AT LEAST ONE REINFORCING WEB OF INTERCROSSED FILAMENTARY MATERIAL THE FILAMENTS OF WHICH ARE AT APPROXIMATELY 45* TO THE LONGITUDINAL AXIS THE SHEATHS, SURROUNDING THE SUPERPOSED CONNECTED SHEATHS OVER THEIR ENTIRE PERIPHERIES WITH A SUPPLEMENTARY WOVEN COVER BANDING THE SHEATHS TOGETHER, DISPOSING THE RESULTING SUPERPOSED BANDED STRUCTURE OF MILTIPLE TUBES IN A MOLD WHICH MAINTAINS THE SUPERPOSED STRUCTURE AND HAVING THE SHAPE OF A TENNIS RACKET FRAME WITH SAID RESULTING BANDED STRUCTURE OF MULTIPLE TUBES FORMING AN INTEGRAL HANDLE AND HOOP TO REINFORCE THE TENNIS RACKET FRAME AT THE POINTS OF LOCALIZATION OF FORCES TO GIVE A BANDING EFFECT, IMPREGNATING THE STRUCTURE OF MULTIPLE TUBES WITH A POLYMERIZABLE SYNTHETIC MATERIAL, INFLATING THE SHEATS, WEB AND COVER INTO CONTACT WITH THE MOLD AND THAN POLYMERIZING THE POLYMERIZABLE SYNTHETIC MATERIAL.
Claim 2
Dependent Claim
182 words
PROCESS FOR THE MANUFACTURE OF TENNIS RACKET FRAMES FROM WOVEN TUBULAR SHEATHS OF FILAMENTARY SYNTHETIC REINFORCED MATERIAL IMPREGNATED WITH A POLYMERIZED SYNTHETIC MATERIAL, THE STEPS OF PLACING AT LEAST TWO SUPERPOSED INFLATABLE SHEATHS HAVING LONG AXES IN CONTACT WITH THEIR LONG AXES PARALLEL, CONNECTING THE SUPERPOSED SHEATHS TO EACH OTHER AND FORMING BETWEEN THEM AT LEAST ONE REINFORCING WEB OF INTERCROSSED FILAMENTARY MATERIAL THE FILAMENTS OF WHICH ARE AT APPROXIMATELY 45* TO THE LONGITUDINAL AXIS THE SHEATHS, SURROUNDING THE SUPERPOSED CONNECTED SHEATHS OVER THEIR ENTIRE PERIPHERIES WITH A SUPPLEMENTARY WOVEN COVER BANDING THE SHEATHS TOGETHER, DISPOSING THE RESULTING SUPERPOSED BANDED STRUCTURE OF MILTIPLE TUBES IN A MOLD WHICH MAINTAINS THE SUPERPOSED STRUCTURE AND HAVING THE SHAPE OF A TENNIS RACKET FRAME WITH SAID RESULTING BANDED STRUCTURE OF MULTIPLE TUBES FORMING AN INTEGRAL HANDLE AND HOOP TO REINFORCE THE TENNIS RACKET FRAME AT THE POINTS OF LOCALIZATION OF FORCES TO GIVE A BANDING EFFECT, IMPREGNATING THE STRUCTURE OF MULTIPLE TUBES WITH A POLYMERIZABLE SYNTHETIC MATERIAL, INFLATING THE SHEATS, WEB AND COVER INTO CONTACT WITH THE MOLD AND THAN POLYMERIZING THE POLYMERIZABLE SYNTHETIC MATERIAL.
Claim 3
Dependent Claim
36 words
A process as described in claim 1, including the steps of first inserting hollow semi-rigid rings of smaller diameter than the sheaths in two inflatable sheaths and then superposing said rings and said sheaths in contact.
Claim 4
Dependent Claim
23 words
Process as described in claim 2, the further step of removing said rings from said sheaths after hardening of the polymerizable synthetic material.
Claim 5
Dependent Claim
56 words
Process as described in claim 1, the frame having a hoop and a heart, the step of disposing the banded structure of multiple tubes in the mold including surrounding the hoop and the heart of the racket frame therewith and disposing a part of the structure of multiple tubes around the heart of the racket frame.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |