Portable projection device
US5143442A · kind A · utility
51Cited by
8References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 7, 1991 |
| Grant date | Sep 1, 1992 |
| Priority date | — |
| Expiry date | May 7, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S362/80
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A portable projection device has a case-like body made of synthetic resin and formed hollow in which a lens, a circuit connected to a light emitting means, a power source and resistances, a display film and a film setting section are arranged and housed. The circuit is opened and closed by a switch arranged on the case-like body to thereby render the portable projection device operative and inoperative. The portable projection device can be used as a time-displaying timepiece, a flashlight, an alarm lamp, a guide lamp or the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.