Patent ID: 6768107
Filing Date: 2004-07-27
Classification: G01N,H01J

Abstract:
A method of producing an electrospray device comprising:providing a substrate having opposed first and second surfaces, each coated with a photoresist; exposing the photoresist on the first surface to an image to form a pattern in the form of a spot on the first surface; removing the photoresist on the first surface where the pattern is in the form of a hole in the photoresist; removing material from the substrate coincident with the hole in the photoresist on the first surface to form a channel extending through the photoresist on the first surface and through the substrate up to the photoresist on the second surface; exposing the photoresist on the second surface to an image to form an annular pattern circumscribing an extension of the channel through the photoresist on the second surface; removing the photoresist on the second surface where the annular pattern is; removing material front the substrate coincident with where the pattern in the photoresist on the second surface has been removed to form an annular recess extending partially into the the substrate; and removing all coatings from the first and second surface of the substrate to form the electrospray device.