Formation of polycarbonate film with apertures determined by etching charged-particle tracks
US5914150A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Feb 28, 1997 |
| Grant date | Jun 22, 1999 |
| Priority date | — |
| Expiry date | Feb 28, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2329/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A technique for creating openings in a polycarbonate film entails providing a liquid chemical formulation that contains polycarbonate material, a liquid that dissolves the polycarbonate, and possibly one or more other constituents. The liquid is typically capable of dissolving the polycarbonate to a concentration of at least 1% at 20.degree. C. and 1 atmosphere. Examples of the liquid include pyridine, a ring-substituted pyridine derivative, pyrrole, a ring-substituted pyrrole derivative, pyrrolidine, a pyrrolidine derivative, chlorobenzene, and cyclohexanone. A liquid film (36A) of the chemical formulation is formed over a substructure (30) and processed to remove the liquid, thereby converting the liquid film into a solid polycarbonate track layer (38). Charged particles (70) are passed through the track layer to form charged-particle tracks (72) at least partway through the layer. Apertures (74) are created through the track layer by a process that entails etching along the tracks. The aperture-containing polycarbonate track layer is typically employed in fabricating a gated electron-emitting device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.