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US 2019/0314751 A1Published application
Air filter with visual filter life indicator zone and sorbent-loaded visual reference zone
Assignee3M Innovative Properties Company
InventorsLiang Cheng, Andrew R. Fox, Himanshu Jasuja, Zhiqun Zhang
Life of this patent
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Abstract
An air filter (1) comprises an air filter media (10) with a sorbent-free area (20) that provides a visual filter life indicator zone (30) and with a sorbent-loaded area (26) that provides a visual reference zone (27).
Claims20
An air filter comprising an air filter media that comprises a visual filter life indicator zone and a visual reference zone, the air filter media comprising:
- a nonwoven fibrous filtration web comprising at least some fibers that comprise charged electret moities, wherein the nonwoven fibrous filtration web comprises a first major surface with an active particle-filtration area that includes at least one sorbent-free area and at least one sorbent-loaded area,
- wherein the at least one sorbent-free area is configured to provide a visual filter life indicator zone of the air filter, and
- wherein the at least one sorbent-loaded area is configured to provide a visual reference zone for the visual filter life indicator zone.
Dependencies are inferred from the claim text.