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