Helical visual display device
US4916752A · kind A · utility
12Cited by
12References
5Claims
0Family size
Inventor
Key dates
| Filing date | Apr 3, 1989 |
| Grant date | Apr 17, 1990 |
| Priority date | — |
| Expiry date | Apr 3, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB44F1/10
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A visual display device having two helices each wound from a single tubular-like material about a common axis and one of the helices being within the peripheral confines of the other and the coils of the one helix being wound in the same direction as the wound direction of the coils in the other helix, so that when the device as a whole is rotated the two helices appear to perpetually move in simultaneously opposite directions, thus offering to the viewer of the rotating display device an aesthetically interesting sight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.