Air cleaner and method of controlling operation of same

Attachable air filter for an air vent register

End of service life indicator for respirator

Filter systems including optical analyte sensors and optical readers

Filter cartridge having location-registered view window for end-of-service-life-indicator (ESLI)

Hanging air filter

Protective cover for respiratory device

Air vent filter and freshener container

Mount for air filter and bezel assembly

Forced air duct end filter assembly

Sorption column

ELECTRET ARTICLE HAVING HETEROATOMS AND LOW FLUOROSATURATION RATIO

Electrets and compounds useful in electrets

Extended surface pleat air filter

Electret article having heteroatoms and low fluorosaturation ratio

Electret article having high fluorosaturation ratio

Conformal filter cartridges and methods

Respiratory protection device that has rapid threaded clean air source attachment

Self-powered, wearable personal air purifier

Air cleaner assembly

Method of making a filter cartridge using a thermoforming step

Personal inhalation filter

Self-sealing protection filter port

Multilumen unilimb breathing circuit with detachable proximal fitting