Patent US3581630A successfully refreshed from Google Patents.
US3581630A
Expired / Lapsed
US
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Plastic ski track
Assignee: FRANCIS F DEL PIANO
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Filing: 1968-08-09
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Granted: 1971-06-01
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Expires: 1988-08-09
Abstract
Abstract The specification describes a plastic ski track composed of interlocking track elements roughly rectangular in shape. Each track element contains a plurality of parallel rows of upright support members inclined from the vertical at an angle in the direction of the ski course. The elements may be fabricated by injection molding of a plastic composition, such as polyethylenebased compound.
Inventors
- 👤 Francis F Del Piano
- 👤 Tino Cazzaniga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:53
CPC Classifications
E; E01; E01C; E01C13/00; E01C13/10; E01C13/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
94 words
An interlocking track element, for combination with like or dissimilar elements to form a ski track, which comprises: a flat supporting surface and a number of openings; a large number of upright support members in parallel rows extending from said surface and partially overhanging over at least some of said openings, said support members being inclined in a single direction at an angle of between about 10* and about 45* from the vertical; means for interlocking said element with adjacent elements; and a largely open underside having a network of vertical ribs for support.
Claim 2
Dependent Claim
94 words
An interlocking track element, for combination with like or dissimilar elements to form a ski track, which comprises: a flat supporting surface and a number of openings; a large number of upright support members in parallel rows extending from said surface and partially overhanging over at least some of said openings, said support members being inclined in a single direction at an angle of between about 10* and about 45* from the vertical; means for interlocking said element with adjacent elements; and a largely open underside having a network of vertical ribs for support.
Claim 3
Dependent Claim
36 words
The interlocking track element of claim 1, wherein the upright support members cover at least about 75 percent of the area of the element and are inclined at an angle of about 20*-25* from the vertical.
Claim 4
Dependent Claim
34 words
The interlocking track element of claim 1, wherein the dimensions of a single element are about 13 1/4 inches in length, about 6 1/2 inches in width, and about 1 3/4 inches in height.
Claim 5
Dependent Claim
26 words
The interlocking track element of claim 1, wherein the network of vertical ribs comprises a peripheral rib, a longitudinal rib and a number of transverse ribs.
Claim 6
Dependent Claim
35 words
The interlocking track element of claim 1, wherein the element is fabricated by injection molding of a plastic material, selected from the group consisting of polyolefins, halogenated olefin polymers, polystyrene synthetic rubbers, and combinations thereof.
Claim 7
Dependent Claim
13 words
The interlocking track element of claim 5, wherein the plastic material is polyethylene-based.
Claim 8
Dependent Claim
17 words
The interlocking track element of claim 5, wherein the plastic material contains a lubricant and an antioxidant.
Claim 9
Dependent Claim
48 words
The interlocking track element of claim 1, wherein the element is fabricated by injection molding of a plastic material comprising about 90-95 percent high density polyethylene, about 5-10 percent polyisobutylene, about 0.25-1 percent of a lubricant and about 0.25-1 percent of an antioxidant, ultraviolet absorber or other stabilizer.
References Cited (Backward Citations)
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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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |