Patent US3844576A successfully refreshed from Google Patents.
US3844576A
Expired / Lapsed
US
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Vibration damped ski
Assignee: SITCA ACQUISITIONS Inc (SITCA) A CORP OF WA
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Filing: 1973-07-18
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Granted: 1974-10-29
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Expires: 1993-07-18
Abstract
Abstract A ski structure of the multi-layer type having a core and one or more intermediate load-bearing layers above and below the core wherein at least one of the intermediate layers is a laminate comprising a layer of material having a relatively high modulus of elasticity with elastomeric material bonded to opposite faces of the high modulus of elasticity material, with at least a portion of the elastomeric material possessing pronounced viscoelastic properties.
Inventors
- 👤 H Schultes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:38
CPC Classifications
A; A63; A63C; A63C5/00; A63C5/12; A63C5/122; A63C5/06; A63C5/075; A63C5/126
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
93 words
A laminated ski structure of the type comprising a core, a top surface, a bottom surface, and one or more interbonded intermediate layers disposed between said top and bottom surfaces, the improvement comprising at least one of said intermediate layers being a vibration damping laminate comprising a layer of material having a relatively high modulus of elasticity and respective layers of elastomeric material bonded to opposite faces of said layer of high modulus material, at least one of said layers of elastomeric material having a loss tangent which is greater than about 0.8.
Claim 2
Dependent Claim
93 words
A laminated ski structure of the type comprising a core, a top surface, a bottom surface, and one or more interbonded intermediate layers disposed between said top and bottom surfaces, the improvement comprising at least one of said intermediate layers being a vibration damping laminate comprising a layer of material having a relatively high modulus of elasticity and respective layers of elastomeric material bonded to opposite faces of said layer of high modulus material, at least one of said layers of elastomeric material having a loss tangent which is greater than about 0.8.
Claim 3
Dependent Claim
24 words
The ski structure of claim 1, wherein each of said layers of elastomeric material has a loss tangent which is greater than about 0.8.
Claim 4
Dependent Claim
21 words
The ski structure of claim 1, wherein said vibration damping laminate is offset downwardly from the neutral axis of the ski.
Claim 5
Dependent Claim
20 words
The ski structure of claim 1, wherein said vibration damping laminate extends for substantially the full length of the ski.
Claim 6
Dependent Claim
72 words
A laminated ski of the type comprising a top surface, a bottom surface, and a plurality of intermediate layers between said top and bottom surfaces at least one of said intermediate layers being a laminate including a member of a material of relatively high modulus of elasticity substandially completely surrounded by an elastomeric material, at least a portion of said elastomeric material having a loss tangent which is greAter than about 0.8.
Claim 7
Dependent Claim
72 words
A laminated ski of the type comprising a top surface, a bottom surface, and a plurality of intermediate layers between said top and bottom surfaces at least one of said intermediate layers being a laminate including a member of a material of relatively high modulus of elasticity substandially completely surrounded by an elastomeric material, at least a portion of said elastomeric material having a loss tangent which is greAter than about 0.8.
Claim 8
Dependent Claim
21 words
The ski of claim 5, wherein all of said elastomeric material has a loss tangent which is greater than about 0.8.
Claim 9
Dependent Claim
24 words
The ski of claim 5, wherein said laminate of high modulus material and elastomeric material extends for substantially the entire length of the ski.
Claim 10
Dependent Claim
25 words
The ski of claim 5, wherein said laminate of high modulus material and elastomeric material is downwardly offset from the neutral axis of the ski.
Claim 11
Dependent Claim
71 words
A laminated ski structure of the type comprising a core, a top surface, a bottom surface and one or more intermediate layers disposed between said top and bottom surfaces, the improvement comprising at least one of said intermediate layers being a vibration damping laminate comprising a material having a loss tangent which is greater than about 0.8 substantially completely surrounding a layer of material having a relatively high modulus of elasticity.
Claim 12
Dependent Claim
71 words
A laminated ski structure of the type comprising a core, a top surface, a bottom surface and one or more intermediate layers disposed between said top and bottom surfaces, the improvement comprising at least one of said intermediate layers being a vibration damping laminate comprising a material having a loss tangent which is greater than about 0.8 substantially completely surrounding a layer of material having a relatively high modulus of elasticity.
Claim 13
Dependent Claim
89 words
A laminated ski structure of the type comprising a top surface, a bottom surface, and a plurality of intermediate layers disposed between said top and bottom surfaces, at least one of said intermediate layers comprising a member of material having a high modulus of elasticity substantially completely encased in an elastomeric material, at least a portion of which has a loss tangent which is greater than about 0.8, a rearward end portion of said high modulus member being secured to at least one other intermediate layer of the ski.
Claim 14
Dependent Claim
89 words
A laminated ski structure of the type comprising a top surface, a bottom surface, and a plurality of intermediate layers disposed between said top and bottom surfaces, at least one of said intermediate layers comprising a member of material having a high modulus of elasticity substantially completely encased in an elastomeric material, at least a portion of which has a loss tangent which is greater than about 0.8, a rearward end portion of said high modulus member being secured to at least one other intermediate layer of the ski.
Claim 15
Dependent Claim
22 words
The ski structure of claim 10, wherein all of said elastomeric material has a loss tangent which is greater than about 0.8.
Claim 16
Dependent Claim
25 words
The ski structure of claim 10, wherein said high modulus member and said encasing elastomeric material extend for substantially the entire length of the ski.
Claim 17
Dependent Claim
26 words
The ski structure of claim 10, wherein said high modulus member and said encasing elastomeric material are offset downwardly from the neutral axis of the ski.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |