Patent · US Expired

Ski with three-dimensional running surface

US4178012A · kind A · utility

21Cited by

2References

21Claims

0Family size

Assignee

Trak, Inc. · US

Inventors

Walter Roth · Sankt Gallen, CH
Hans Woitschatzke · Grünwald, DE

Key dates

Filing date	Dec 2, 1977
Grant date	Dec 11, 1979
Priority date	—
Expiry date	Dec 2, 1997

Classification

Technology area (CPC A)Human Necessities
CPC primaryA63C5/0428
WIPO fieldFurniture, games
WIPO sectorOther fields

Abstract

A three-dimensional ski base and skis having the ski base secured thereto as a running surface, the ski base comprising a plurality of scale-like protuberances inclined with respect to the bottom plane of the running surface of the ski and which rise toward the rear end of the ski, the surfaces of the protuberances convexly curved both in a longitudinal and in a transverse direction of the running surface to provide a resistance to backward movement and improved sliding properties in forward movement.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.