Patent US3222607A successfully refreshed from Google Patents.
US3765239A
Expired / Lapsed
US
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Flow measuring device
Assignee: Siemens AG
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Filing: 1971-03-22
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Granted: 1973-10-16
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Expires: 1991-03-22
Abstract
Abstract A device is used for measuring the flow of media flowing in conduits, particularly of breathing gas directed to and/or from a patient in respirators. The device is particularly characterized by actuating means for setting the device in a zero position when the passage of the flow is zero.
Inventors
- 👤 S Olsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:51
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/08; A61B5/087
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
141 words
A device for measuring the flow of a medium, such as breathing gas, said device comprising a conduit for the medium, an actuating valve located in the conduit and regulating the flow of the flowing medium in the conduit, and a flow measurer located in the conduit and producing an electrical signal, said signal being a measure for the strength of the flow passing through the conduit, said device further comprising a capacitor connected to the signal-output of said flow measurer, a signal-amplifier connected to said capacitor and having a high-ohmic input impedance, switching means connected to the input of said amplifier, and actuating means connected to said switching means and to said valve, said actuating means operating said switching means depending on the movement of said valve to place the amplifier input at zero potential when the valve is closed.
Claim 2
Independent Claim
141 words
A device for measuring the flow of a medium, such as breathing gas, said device comprising a conduit for the medium, an actuating valve located in the conduit and regulating the flow of the flowing medium in the conduit, and a flow measurer located in the conduit and producing an electrical signal, said signal being a measure for the strength of the flow passing through the conduit, said device further comprising a capacitor connected to the signal-output of said flow measurer, a signal-amplifier connected to said capacitor and having a high-ohmic input impedance, switching means connected to the input of said amplifier, and actuating means connected to said switching means and to said valve, said actuating means operating said switching means depending on the movement of said valve to place the amplifier input at zero potential when the valve is closed.
Claim 3
Dependent Claim
32 words
A device in accordance with claim 1, wherein the actuating means comprise a photo-cell device sensing the valve movement and producing an actuating impulse for the switching means when the valve closes.
Claim 4
Dependent Claim
25 words
A device in accordance with claim 2, wherein said switching means comprise a field effect transistor actuated by the actuating impulse of the photo-cell device.
References Cited (Backward Citations)
US3424000A
Cited
FR1508303A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |