Agilent Technologies, Inc.

William G Chesk

Stanley P Woods

Bill J Peck

David R Adaskin

A generalized printhead control model is provided herein as a basis for configuring printhead control software that will operate any selected printhead or group of printheads. The subject model covers a hierarchy of classes for the attributes of software that controls the printheads in a system, such as for producing a biopolymer array.

Generalized pulse jet ejection head control model

Devices and methods are disclosed for sensing the level of a fluid in a reservoir. The device comprises a generator for generating symmetrical pulses of electric potential, a ground generator in communication with the above generator, means for sensing resistance, and a latch circuit in communication with the above means for sensing resistance. In a method of the invention, a first electric potential is applied to an electrode within the reservoir. The first electric potential has a predetermined value and duration. The resistance of fluid within the reservoir is measured during application of the first electric potential. A second electric potential is applied to the electrode after the measurement for a period of time substantially equivalent to the duration of the first electric potential and of a value substantially equivalent to and opposite to the predetermined value of the first electric potential.

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San Jose, CA, United States of America

William G Chesk