Patent US4275885A successfully refreshed from Google Patents.
US4275885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tennis racket
Assignee: Head Sport GmbH
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Filing: 1979-08-06
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Granted: 1981-06-30
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Expires: 1999-08-06
Abstract
Abstract The head of the tennis racket has an oblong, oval shape so that the strung ball hitting area has a length to width ratio of about 1.75:1.
Inventors
- 👤 John G. Howe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:20
CPC Classifications
A; A63; A63B; A63B49/00; A63B49/02; A63B49/022; A63B49/10; A63B60/00; A63B60/06; A63B60/14; A63B2049/0201; A63B2049/0203; A63B2049/0204; A63B2049/0207; A63B60/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
185 words
A tennis racket comprising a single piece unitary hollow tubular frame constructed from blended graphite-fiberglass composite, said frame comprising a loop portion and a handle portion interconnected by an integral open throat portion, a part of said throat portion comprising a continuation of said loop portion to make said loop portion an enclosed open loop, an outer circumferential stringing groove formed in said loop portion, stringing holes formed in said groove and throat portion part, tennis racket strings extending through said holes lengthwise and crosswise said enclosed open loop, all of said loop, handle and throat portions and said tennis strings being coplanar, said enclosed open loop having an oblong oval shape, said lengthwise strings being about 14" long and said crosswise strings being about 8" long whereby the ratio of the length to the width of the inner strung area of said oblong oval shape is about 1.75 to 1, and said strung area of said oblong oval shape comprising about half of the total length of said racket and said handle and throat portion together comprising the remaining other half of said racket.
Claim 2
Dependent Claim
185 words
A tennis racket comprising a single piece unitary hollow tubular frame constructed from blended graphite-fiberglass composite, said frame comprising a loop portion and a handle portion interconnected by an integral open throat portion, a part of said throat portion comprising a continuation of said loop portion to make said loop portion an enclosed open loop, an outer circumferential stringing groove formed in said loop portion, stringing holes formed in said groove and throat portion part, tennis racket strings extending through said holes lengthwise and crosswise said enclosed open loop, all of said loop, handle and throat portions and said tennis strings being coplanar, said enclosed open loop having an oblong oval shape, said lengthwise strings being about 14" long and said crosswise strings being about 8" long whereby the ratio of the length to the width of the inner strung area of said oblong oval shape is about 1.75 to 1, and said strung area of said oblong oval shape comprising about half of the total length of said racket and said handle and throat portion together comprising the remaining other half of said racket.
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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) | 1984-06-29 | 1984-12-29 | 1985-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-29 | 1988-12-29 | 1989-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-29 | 1992-12-29 | 1993-06-30 | $7700.00 | Window Closed / Lapsed |