Air filters for domestic use; Air filters for household purposes; Air filters for household use

Water filtering apparatus; Water purification installations; Water purifying apparatus and machines; Filters for drinking water

downloadable computer software to assist in the design of electronic active filters, namely, electronic circuits and systems that condition signals on the basis of frequency in the field of electronics

computer programs in the form of disks and instruction manuals sold as a unit therewith to assist in the design of electronic active filters

Electric food dehydrators

Automated reminder services to customers for air filter replacement; Providing temporary use of on-line non-downloadable software for use in tracking and scheduling maintenance services for heating and air conditioning equipment and sending electronic mail for maintenance reminders notifying customers to replace the air filter at the recommended time intervals