Fabrication of diffractive subtractive filter embossing master

Fabrication of microlenses

Facility for improving environmental atmosphere of interior...

False color photographic element and process

Fan cooling system

Fan having blade members that heat and cool and has an...

Film and method for forming intaglio printing plates

Film pack with means for urging positive and negative sheets tog

Film unit assembly

Film unit comprising an image receiving element and light interc

Filter and accessory mount for upright vacuum cleaner exhaust po

Filter assemblies with adhesive attachment systems

Filter assembly

Filter device for air purification

Filter for a respiratory device

Filter for gaseous media

Filter for particulate materials in gaseous fluids

Filter for particulate materials in gaseous fluids

Filter having a change indicator

Filter insert