Process for fabricating a projection electron lithography mask and a removable reusable cover for use therein
US6251543A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 1999 |
| Grant date | Jun 26, 2001 |
| Priority date | — |
| Expiry date | Jun 14, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F1/20
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A removable, reusable cover constructed such that its geometry matches the geometry of the active region of a projection electron lithography mask to be protected and does not etch in the plasma environment used to remove a photoresist. The cover protects the active region of the projection electron lithography mask, but does not contact the active region. A technique for fabricating a projection electron lithography mask utilizing the removable, reusable cover, where the geometry of the cover is matched to the geometry of an active region of the projection electron lithography mask to be protected. During fabrication of the projection electron lithography mask, the cover protects the active region of the projection electron lithography mask from the plasma environment, but does not contact the active region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.