Photographic roll film
US6162594A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 13, 2000 |
| Grant date | Dec 19, 2000 |
| Priority date | — |
| Expiry date | Jan 13, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/261
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic roll film such as Brownie film is placed on a backing paper or a leader paper. The roll film is joined at its one or both ends to the backing paper or leader paper with a jointing tape, which has on its surface a bar code composed of light absorbing bars and light reflecting spaces. The light absorbing bars show a reflectance of less than 30% and a glossiness of less than 20%, and the light reflecting spaces show a reflectance of more than 50% and a glossiness of less than 35%. Further, the total of the glossiness of light absorbing bars and the glossiness of light reflecting spaces is less than 50%. The reflectance and glossiness both are determined utilizing a light in a wavelength region other than a light sensitive wavelength region of the roll film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.