Patent 6142146 Issued on November 7, 2000. Estimated Expiration Date: June 12, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
A dry powder inhaler comprises a first chamber in which a dry powder may be deaggregated by a vibrator and separated by size, and a second chamber in which the size-separated deaggregated powder may be picked up by an air stream and carried for introduction into a patient. Electronic circuitry is included for controlling dosing.