4. Measuring and testing
  5. Volume or rate of flow
  6. Using differential pressure

Porter Instrument Company, Inc.

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Air valve for a breathing system

Fluid handling – Line condition change responsive valves – With separate connected fluid reactor surface
Patent

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Atomizer

Gas and liquid contact apparatus – With external supply or removal of heat – Heat exchange means at or downstream of contact zone
Reexamination Certificate

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Control valve actuated by low-pressure and low-flow-rate...

Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Reexamination Certificate

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Flow controller

Measuring and testing – Volume or rate of flow – Proportional
Reexamination Certificate

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Flowmeter tubes and method of installing them

Measuring and testing – Volume or rate of flow – Using differential pressure
Patent

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