Claims
- 1. A method of electrostatically applying grains to a substrate comprising:a. adhering the substrate to an electrostatic chuck with a vacuum conveyed to the substrate through the electrostatic; b. activating one or more one grain collection zones on the electrostatic chuck by applying voltage to one or more electrodes associated with the grain collection zones; c. directing a cloud of grains charged with a given polarity towards the one or more activated grain collection zones, the voltages applied to the associated electrodes selected to attract the grains; and d. electrostatically adhering charged grains on portions of the substrate corresponding to the activated grain collection zones.
- 2. The method of claim 1, wherein the grains are at least 1 micron in diameter.
- 3. The method of claim 1, wherein the applied voltage selectively attracts charged grains to at least two grain collection zones defined by the electrostatic chuck.
- 4. The method of claim 1, wherein the grains are 1 to 10 microns in diameter.
- 5. The method of claim 1, wherein the substrate is a polymeric film.
- 6. The method of claim 5, wherein the the charged grains comprise a pharmaceutical and the substrate is a flexible polymeric film suitable for consumption by an animal.
Parent Case Info
The present application is a Continuation-in-part of U.S. application Ser. No. 08/630,012, filed Apr. 9, 1996, now U.S. Pat. No. 5,788,814.
US Referenced Citations (16)
Foreign Referenced Citations (2)
Number |
Date |
Country |
2 149 697 |
Jun 1985 |
GB |
WO 9737803 |
Oct 1997 |
WO |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
08/630012 |
Apr 1996 |
US |
Child |
09/095321 |
|
US |