Patent ID: 6956207
Filing Date: 2005-10-18
Classification: B01J,G01N,H01J

Abstract:
1. A method of producing an electrospray device comprising: providing a substrate having opposed first and second surfaces, at least the first surface coated with a photoresist over an etch-resistant material; exposing the photoresist on the first surface to an image to form a pattern in the form of at least one ring on the first surface; removing the exposed photoresist on the first surface which is outside and inside the at least one ring to form an annular portion; removing the etch-resistant material from the first surface of the substrate where the exposed photoresist was removed to form holes in the etch-resistant material; optionally, removing all photoresist remaining on the first surface; exposing the photoresist on the second surface to an image to from a pattern circumscribing extensions of the at least one ring formed in the etch-resistant material of the first surface; removing the exposed photoresist on the second surface; removing the etch-resistant material on the second surface where the photoresist was removed; removing material from the substrate coincident with where the etch-resistant material on the second surface was removed to form a reservoir extending partially into the substrate; optionally, removing the remaining photoresist on the second surface; coating the second surface with an etch-resistant material; coating the first surface with a second coating of photoresist; exposing the second coating of photoresist within the at least ring to an image; removing the exposed second coating of photoresist from within the at least one ring to form at least one hole; removing material from the substrate coincident with the at least one hole in the second layer of photoresist on the first surface to form at least one passage extending through the second layer of photoresist on the first surface and into the substrate to the extent needed to reach the etch-resistant material coating the reservoir; removing photoresist from at least the first surface; applying an etch-resistant layer to all exposed surfaces of the substrate; removing the etch-resistant layer from the first surface that is around the at least one ring; removing material from the substrate exposed by the removed etch-resistant layer around the at least one ring to define at least one nozzle on the first surface; removing from the substrate at least the etch-resistant material coating the reservoir; applying an etch-resistant material to all surfaces of the substrate; filling at least one of the reservoir and the at least one passage with a polymerizable material; and polymerizing the polymerizable material.