Patent ID: 7367781

Claim:
A packaged micromachined device including at least one narrow channel, the device comprising: a substrate having an inner surface; a cover having inner and outer surfaces and attached to the substrate; and at least one layer located between the inner surfaces to form the micromachined device including at least one narrow gas or liquid channel having a hydraulic diameter when the substrate and the cover are attached together, wherein the micromachined device includes a micropump having at least one stage wherein the micropump is a thermal transpiration micropump and wherein the device further comprises a plurality of sealed microchambers including first and second microchambers and wherein the at least one narrow channel communicates the first and second microchambers and wherein the micromachined device further comprises at least one micromachined structure for creating a temperature difference between first and second ends of the at least one narrow channel in order to generate a pumping effect.