Patent US4093268A successfully refreshed from Google Patents.
US4093268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic drag reducing surfacing material
Assignee: International Paper Co
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Filing: 1976-10-18
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Granted: 1978-06-06
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Expires: 1996-10-18
Abstract
Abstract A substrate, useful as the base layer on a snow ski is made, comprising a rigid plastic matrix and from about 5 wt.% to about 45 wt.% of a thermoplastic, water soluble polymer disposed within the plastic matrix; wherein the substrate provides a surface where the water soluble polymer will be leached out of the rigid plastic matrix upon contact with water; to provide a boundary lubricant film.
Inventors
- 👤 Ronald N. Sampson
- 👤 Zal N. Sanjana
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:05
CPC Classifications
A; A63; A63C; A63C5/00; A63C5/04; A63C5/056
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
74 words
A ski comprising a core bonded to a base layer, wherein the base layer comprises a rigid plastic matrix and from about 5 wt.% to about 45 wt.% of a thermoplastic, water soluble polymer disposed within the plastic matrix, wherein the base layer provides a surface where the water soluble polymer will be leached out of the rigid plastic matrix upon contact with water, to provide a boundary lubricant film on the layer surface.
Claim 2
Dependent Claim
74 words
A ski comprising a core bonded to a base layer, wherein the base layer comprises a rigid plastic matrix and from about 5 wt.% to about 45 wt.% of a thermoplastic, water soluble polymer disposed within the plastic matrix, wherein the base layer provides a surface where the water soluble polymer will be leached out of the rigid plastic matrix upon contact with water, to provide a boundary lubricant film on the layer surface.
Claim 3
Dependent Claim
39 words
The ski of claim 1, wherein the base layer is bonded to a reinforcing layer selected from the group consisting of fiberglass, Dacron, rayon and cotton cloth, said reinforcing layer disposed between the base layer and the ski core.
Claim 4
Dependent Claim
36 words
The ski of claim 1, wherein the water soluble polymer is selected from the group consisting of polyacrylamide, carboxy methyl cellulose, sodium carboxy methyl cellulose, polysaccharide, guar gum, vinyl pyridine, poly (ethylene oxide) and mixtures thereof.
Claim 5
Dependent Claim
14 words
The ski of claim 1, wherein the water soluble polymer is poly (ethylene oxide).
Claim 6
Dependent Claim
23 words
The ski of claim 3, wherein the water soluble polymer is present in the range of from about 10 wt.% to 30 wt.%.
Claim 7
Dependent Claim
37 words
The ski of claim 3, wherein the plastic matrix is selected from the group consisting of polyethylene plastic, epoxy plastic, polyurethane plastic, polyvinyl alcohol plastic, polyvinyl chloride plastic, polypropylene plastic, polytetraflouroethylene plastic, polyester plastic and mixtures thereof.
Claim 8
Dependent Claim
49 words
The ski of claim 6, wherein the water soluble polymer will be leached from the matrix at the rage of at least 100 parts of water soluble polymer per 1,000,000 parts of water in the snow to form a polymer containing lubricant film, and the plastic matrix is polyethylene.
Claim 9
Dependent Claim
23 words
The ski of claim 6 wherein the plastic matrix is polyethylene having a density of between about 0.93 grams/cu.cm. to about 0.97 grams/cu.cm.
Claim 10
Dependent Claim
110 words
A snow ski comprising a flexible core surrounded by and bonded to a top surface, base layer and sidewall surfaces between the top surface and base layer, wherein the base layer comprises a rigid polyethylene plastic matrix and from about 5 wt.% to about 45 wt.% of poly (ethylene oxide) disposed within the plastic matrix, wherein the base layer provides a surface where the poly (ethylene oxide) will be leached out of the rigid plastic matrix upon contact with snow at the range of at least 100 parts of ethylene oxide per 1,000,000 parts of water in the snow, to provide a boundary lubricant film on the base layer surface.
Claim 11
Dependent Claim
110 words
A snow ski comprising a flexible core surrounded by and bonded to a top surface, base layer and sidewall surfaces between the top surface and base layer, wherein the base layer comprises a rigid polyethylene plastic matrix and from about 5 wt.% to about 45 wt.% of poly (ethylene oxide) disposed within the plastic matrix, wherein the base layer provides a surface where the poly (ethylene oxide) will be leached out of the rigid plastic matrix upon contact with snow at the range of at least 100 parts of ethylene oxide per 1,000,000 parts of water in the snow, to provide a boundary lubricant film on the base layer surface.
Claim 12
Dependent Claim
40 words
The snow ski of claim 9, wherein the base layer is bonded to a reinforcing layer selected from the group consisting of fiberglass, Dacron, rayon and cotton cloth, said reinforcing layer disposed between the base layer and the ski core.
References Cited (Backward Citations)
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Cited
FR1238541A
Cited
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Cited
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Cited
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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) | 1981-06-05 | 1981-12-05 | 1982-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-05 | 1985-12-05 | 1986-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-05 | 1989-12-05 | 1990-06-06 | $7700.00 | Window Closed / Lapsed |