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US 9,011,584 B2Granted
End of service life indicator for respirator
AssigneeHoneywell International Inc.
InventorsPeter Tobias, Christopher Scott Larsen
Life of this patent
Estimating the term…
Abstract
A device includes a cartridge containing a filter material. An insert extends through at least a portion of the filter material. The insert has gas sample path with an opening to provide a sample of air that is representative of the saturation of the filter material. A return path may be included in the insert to return sampled gas to the filter material. A gas mask contains a gas sensor and coupled to the cartridge, which may be replaced when saturated.
Claims19
A device comprising:
- a cartridge containing a filter material, wherein the cartridge includes an adapter operable to removably couple to a respirator mask;
- and
- an insert extending from the adapter upstream in the cartridge through at least a portion of the filter material and having a first path with an opening to provide a sample of air that is representative of the saturation of the filter material;
- wherein the first path extends from the adapter upstream in the cartridge.
1 more element
A device comprising:
- a cartridge containing a filter material and an adapter operable to couple to a gas sensor incorporated into a. respirator mask;
- and
- an insert extending from the adapter upstream in the cartridge through at least a portion of the filter material and having a first path with an opening to provide a sample of air to the gas sensor that is representative of the saturation of the filter material and a second path and opening to return the sample of air to the filter material, the second path opening being downstream of the path opening of the first path to provide a difference in pressure between the openings when air is drawn through the filter material by a user of the device;
- wherein the first path extends from the adapter upstream in the cartridge, and the second path extends from adapter upstream in the cartridge.
1 more element
A device comprising:
- a cartridge containing a filter material and an adapter operable to couple to a gas sensor incorporated into a respirator mask, the adapter comprising at least two circular channels, each of which is coupled to a respective path to provide rotational symmetry to couple to the gas sensor;
- an insert extending from the adapter upstream in the cartridge through at least a portion of the filter material and having a first path with an opening to provide a sample of air to the gas sensor that is representative of the saturation of the filter material, and a second path and opening to return the sample of air to the filter material, the second path opening being downstream of the path opening of the first path to provide a difference in pressure between the openings when air is drawn through the filter material by a user of the device;
- and
- a remotely readable RFID or SAW sensor supported by the cartridge.
1 more element
Dependencies are inferred from the claim text.