US3918731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross-country ski
Assignee: Skis Rossignol SA
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Filing: 1975-02-05
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Granted: 1975-11-11
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Expires: 1995-02-05
Abstract
Abstract A cross-country ski has a foamed synthetic-resin core of generally rectangular cross section covered with a hard epoxy and glass fiber skin. A pair of L-section strips of ABS resin flank this core with the vertical flange of each strip completely covering a respective side of the core and the horizontal flange of each strip extending partially under the bottom of the core. The top of the ski is covered by a single hard layer of a synthetic resin such as nylon. The bottom of the core at least between the bottom flanges of the L-section strips is covered with a similar such hard synthetic-resin layer of substantially lesser thickness than the horizontal flanges of the strips.
Inventors
- 👤 Maurice Legrand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:27
CPC Classifications
A; A63; A63C; A63C5/00; A63C5/12; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/233
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
99 words
A CROSS-COUNTRY SKI COMPRISING A CORE OF CELLULAR SYNTHETIC-RESIN MATERIAL AND HAVING A PAIR OF OPPOSITE LATERAL SIDES AND TOP AND BOTTOM SIDES, A REINFORCED SKIN SURROUNDING SAID CORE, A PAIR OF L-SECTION STRIPS EACH HAVING A VERTICAL FLANGE ENGAGING AND EXTENDING OVER A RESPECTIVE SIDE WALL AND A HORIZONTAL FLANGE EXTENDING PARTIALLY UNDER SAID BOTTOM WALL, A SLIDING LAYER ON SAID BOTTOM WALL AT LEAST BETWEEN SAID HORIZONTAL FLANGES AND OF LESSER VERTICAL THICKNESS THAN SAID HORIZONTAL FLANGES, AND A SYNTHETIC-RESIN LAYER ON SAID TOP WALL COMPLETELY COVERING SAME AND OF SUBSTANTIALLY LESSER THICKNESS THAN SAID VERTICAL FLANGES.
Claim 2
Dependent Claim
99 words
A CROSS-COUNTRY SKI COMPRISING A CORE OF CELLULAR SYNTHETIC-RESIN MATERIAL AND HAVING A PAIR OF OPPOSITE LATERAL SIDES AND TOP AND BOTTOM SIDES, A REINFORCED SKIN SURROUNDING SAID CORE, A PAIR OF L-SECTION STRIPS EACH HAVING A VERTICAL FLANGE ENGAGING AND EXTENDING OVER A RESPECTIVE SIDE WALL AND A HORIZONTAL FLANGE EXTENDING PARTIALLY UNDER SAID BOTTOM WALL, A SLIDING LAYER ON SAID BOTTOM WALL AT LEAST BETWEEN SAID HORIZONTAL FLANGES AND OF LESSER VERTICAL THICKNESS THAN SAID HORIZONTAL FLANGES, AND A SYNTHETIC-RESIN LAYER ON SAID TOP WALL COMPLETELY COVERING SAME AND OF SUBSTANTIALLY LESSER THICKNESS THAN SAID VERTICAL FLANGES.
Claim 3
Dependent Claim
24 words
The ski definEd in claim 1 wherein said L-section strips are formed of a synthetic-resin material of substantially stronger mechanical characteristics than said core.
Claim 4
Dependent Claim
14 words
The ski defined in claim 2 wherein said strips are made of ABS resin.
Claim 5
Dependent Claim
17 words
The ski defined in claim 2 wherein said sliding layer is integrally formed with said horizontal flanges.
Claim 6
Dependent Claim
20 words
The ski defined in claim 4 wherein said sliding layer is approximately one third as thick as said horizontal flanges.
Claim 7
Dependent Claim
16 words
The ski defined in claim 1 wherein said skin is made of glass-fiber reinforced epoxy resin.
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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |