Weighing scales – Weigher responsive material control – Discharge valve or gate
Reexamination Certificate
2011-01-11
2011-01-11
Gibson, Randy W (Department: 2841)
Weighing scales
Weigher responsive material control
Discharge valve or gate
C177S116000, C177S121000, C222S198000, C222S200000, C222S202000, C141S083000
Reexamination Certificate
active
07868260
ABSTRACT:
There is disclosed an apparatus and method which is capable of dispensing very small (typically less than 5 mg) quantities of particles to a high accuracy in a repeatable way and without undue wastage. Also, the need for advanced particle formulation is reduced. The apparatus comprises a closed loop control system which uses an electro-mechanical actuator to deliver impact energy to a supply of particles initially held on a sieve in a hopper. The impact energy causes a small number of particles to fall through the sieve and onto a weight measuring balance. The weight obtained is scrutinised by a processor to see if further actuations are required. In preferred embodiments, the energy of actuation is varied in accordance with the rate of dispensation calculated by the processor. Also, a correction amount can be obtained to take account of the fact that the balance can take a considerable amount of time to settle to its final value.
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MacMichael Bruce
Westland Duncan
Foley & Lardner LLP
Gibson Randy W
PowderJect Research Limited
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