Method for fabricating a diffractive subtractive filter embossing master
US4255514A · kind A · utility
3Cited by
8References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 27, 1979 |
| Grant date | Mar 10, 1981 |
| Priority date | — |
| Expiry date | Apr 27, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/001
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
By flow-melting low-melting point electroplated metal structures, each corresponding to a white-manifesting region of the embossing master, any originally re-entrant shaped structure becomes non-re-entrant. Further, the flow-melting provides a brighter white color capability for the filter embossed in a thermoplastic film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.