Smoking device including a flowmeter

Details Smoking device including a flowmeter Smoking device including a flowmeter

2006-08-01

2006-08-01

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Volume or rate of flow

Thermal type

Reexamination Certificate

active

07082825

ABSTRACT:
A waste-material entry prevention member arranged upstream of a flow sensor is a rod- or plate-like member protruding halfway across the cross-section of a flow passage. Hence, vortexes or energy of the vortexes produced in fluid flowing by the waste-material entry prevention member is diffused by a stream of the fluid passing through a space left between the waste-material entry prevention member and the wall surface of the flow passage which the waste-material entry prevention member faces. Thus, production of vortexes is held down. Further, by making the flow sensor generate heat or heating the flow sensor, thermophoresis of the fluid is caused near the surface of the flow sensor. By this, particles contained in the fluid are prevented from accumulating on the flow sensor.

REFERENCES:
patent: 4785662 (1988-11-01), Ohta et al.
patent: 5878752 (1999-03-01), Adams et al.
patent: 5934289 (1999-08-01), Watkins et al.
patent: 6006757 (1999-12-01), Lichtenberg
patent: 6938473 (2005-09-01), Iwaki et al.
patent: 02-259527 (1990-10-01), None
patent: 04-230808 (1992-08-01), None

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