US3921979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intermediate members for the crossing points of tennis racket stringings
Assignee: Individual
•
Filing: 1973-11-30
•
Granted: 1975-11-25
•
Expires: 1993-11-30
Abstract
Abstract Intermediate members for the crossing points of tennis racket stringings in which the intermediate members are formed as crosspiece guides having crossing tubular or, respectively, groove-shaped portions, which at least partly encompass the strings by means of suitable wings, and which are constituted of a relatively low-friction, self-lubricating plastic or synthetic material.
Inventors
- 👤 Gebhard Dischinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:10
CPC Classifications
A; A63; A63B; A63B51/00; A63B51/10; A63B51/11; Y; Y10; Y10S; Y10S273/00; Y10S273/04
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
127 words
An intermediate crosspiece guide member formed of a lowfriction self-lubricating synthetic material for use in a tennis racket stringing having crossing gutstrings, said member adapted to be mounted intermediate the gutstrings at the crossings thereof, said member comprising first and second recessed portions on opposite sides thereof, said recessed portions each including groove-forming pairs of upstanding wings adapted to extend along and engage at least part of the outer surface of gutstrings adapted to be received in said recessed portions, the groove-forming wings of said first recessed portion extending in a parallel spaced plane and transversely of the groove-forming wings of said second recessed portion adapted to prevent contact between adjacent gutstrings at the crossing thereof and to concurrently guide said gutstrings in coplanar and transverse directions.
Claim 2
Dependent Claim
127 words
An intermediate crosspiece guide member formed of a lowfriction self-lubricating synthetic material for use in a tennis racket stringing having crossing gutstrings, said member adapted to be mounted intermediate the gutstrings at the crossings thereof, said member comprising first and second recessed portions on opposite sides thereof, said recessed portions each including groove-forming pairs of upstanding wings adapted to extend along and engage at least part of the outer surface of gutstrings adapted to be received in said recessed portions, the groove-forming wings of said first recessed portion extending in a parallel spaced plane and transversely of the groove-forming wings of said second recessed portion adapted to prevent contact between adjacent gutstrings at the crossing thereof and to concurrently guide said gutstrings in coplanar and transverse directions.
Claim 3
Dependent Claim
12 words
An improvement as claimed in claim 1, said synthetic material being polyformaldehyde.
Claim 4
Dependent Claim
12 words
An improvement as claimed in claim 1, said synthetic material being polytetrafluoroethylene.
Claim 5
Dependent Claim
20 words
An improvement as claimed in claim 1, said synthetic material being constituted of a polypropylene base and a molybdenum additive.
Claim 6
Dependent Claim
20 words
An improvement as claimed in claim 1, said synthetic material being constituted of a polypropylene base and a graphite additive.
Claim 7
Dependent Claim
20 words
An improvement as claimed in claim 1, said synthetic material being constituted of a polyamide base and a molybdenum additive.
Claim 8
Dependent Claim
20 words
An improvement as claimed in claim 1, said synthetic material being constituted of a polyamide base and a graphite additive.
Claim 9
Dependent Claim
44 words
An improvement as claimed in claim 1, each wing of said pair of upstanding wings being arcuately bent towards the other wing of said pair so as to form a substantially tubular configuration having a slot between the adjacent free ends of said wings.
Claim 10
Dependent Claim
12 words
An improvement as claimed in claim 8, said wings being elastically deformable.
Claim 11
Dependent Claim
17 words
An improvement as claimed in claim 1, each said pair of wings comprising symmetrical mirror-image shaped wings.
Claim 12
Dependent Claim
16 words
An improvement as claimed in claim 1, comprising reinforcing flange means connected to said groove-forming wings.
Claim 13
Dependent Claim
14 words
An improvement as claimed in claim 1, said wings each having profiled end portions.
Claim 14
Dependent Claim
21 words
An improvement as claimed in claim 1, said upstanding wings being curved so as to form a generally hemisphericallyshaped groove therebetween.
Claim 15
Dependent Claim
18 words
An improvement as claimed in claim 1, said upstanding wings of each pair having generally parallel wall portions.
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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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |