Patent US4189142A successfully refreshed from Google Patents.
US4189142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tennis racket
Assignee: Individual
•
Filing: 1977-06-22
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Granted: 1980-02-19
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Expires: 1997-06-22
Abstract
Abstract A tennis racket comprising a frame having two spaced apart peripheral rows of threading openings for two spaced apart string cord layers, and an intermediate flexible layer in at least the central interspace area between said two string cord layers to interconnect said two string cord layers.
Inventors
- 👤 Robert de Vries
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:01
CPC Classifications
A; A63; A63B; A63B51/00; A63B51/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
55 words
A tennis racket comprising a frame having two spaced apart peripheral rows of threading openings for two spaced apart string cord layers in conventional basket weave pattern, and an intermediate layer of a flexible material in at least the central interspace area between said two string cord layers to interconnect said two string cord layers.
Claim 2
Dependent Claim
55 words
A tennis racket comprising a frame having two spaced apart peripheral rows of threading openings for two spaced apart string cord layers in conventional basket weave pattern, and an intermediate layer of a flexible material in at least the central interspace area between said two string cord layers to interconnect said two string cord layers.
Claim 3
Dependent Claim
17 words
A tennis racket according to claim 1 in which said intermediate layer is natural or synthetic rubber.
Claim 4
Dependent Claim
57 words
A tennis racket comprising a frame of identical frame halves, each with a peripheral row of lacing openings for a string cord layer in a conventional basket weave pattern, with an intermediate layer of a flexible material in at least the central interspace area between said two string cord layers to interconnect said two string cord layers.
Claim 5
Dependent Claim
57 words
A tennis racket comprising a frame of identical frame halves, each with a peripheral row of lacing openings for a string cord layer in a conventional basket weave pattern, with an intermediate layer of a flexible material in at least the central interspace area between said two string cord layers to interconnect said two string cord layers.
Claim 6
Dependent Claim
27 words
A tennis racket according to claim 3 in which said frame halves are secured to each other in an adjustable manner for precompressing said intermediate flexible layer.
Claim 7
Dependent Claim
17 words
A tennis racket according to claim 3 in which said intermediate layer is natural or synthetic rubber.
Claim 8
Dependent Claim
27 words
A tennis racket according to claim 5 in which said frame halves are secured to each other in an adjustable manner for precompressing said intermediate flexible layer.
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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) | 1983-02-18 | 1983-08-20 | 1984-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-18 | 1987-08-20 | 1988-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-18 | 1991-08-20 | 1992-02-19 | $7700.00 | Window Closed / Lapsed |