Inventor

DUFFY DEAN R

US43 patents

⚠️ This page may combine multiple inventors who share the name “DUFFY DEAN R”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

DUFFY DEAN R

3M INNOVATIVE PROPERTIES CO

Slip-rib filter gasketing

Self-supporting pleated filter media

Method of forming self-supporting pleated filter media

Filtering face-piece respirator having nose cushioning member

Filtering face-piece respirator having strap-activated folded flange

Respirator including contrast layer

Filtering face-piece respirator having nose cushioning member

Filtering face-piece respirator having darted mask body

Filtering face-piece respirator having nose notch

“Push-on” self attach adaptive filter

Interconnected filter frame and filter framing method

Filter assemblies with adhesive attachment systems

Respirator including contrast layer

Filtering face-piece respirator having folded flange

Filtering face-piece respirator having darted mask body

Filtering face-piece respirator having nose notch

Horizontal flat-fold filtering face-piece respirator having indicia of symmetry

Filtering face-piece respirator with stiffening member integral with filtering structure

Expandable face mask with engageable stiffening element

Filter cross brace

Continuous filter framing strip storable in roll form

Filtering face-piece respirator dispenser

Respiratory mask

DUFFY DEAN R

Horizontal flat-fold filtering face-piece respirator having indicia of symmetry

Filtering face-piece respirator having parallel line weld pattern in mask body

Filter cartridge

Flat fold respirator having flanges disposed on the mask body

Expandable face mask with reinforcing netting

Respirator having folded nose region

Expandable face mask with engageable stiffening element

Joined filter media pleat packs

Parallel bond lines on a fibrous filtration face mask

SPOO SCOTT A

Triangular bond pattern on a personal respiratory protection mask

Flat-fold filtering face-piece respirator having structural weld pattern

Bond pattern on a personal respiratory protection mask

3M INNOVATIVE PROPERTIES COMPANY

Flat-fold respirator having flanges disposed on the mask body

Respirator including transversely-extending pleat and method of forming same

Foldable face-piece respirator with exhalation valve

MINNESOTA MINING & MFG

Zigzag filter media and frame having triangular pleat stabilizing elements

ABEL NATHAN A

Tabs on a personal respiratory protection mask

SUNDET DOUGLAS C

Self-supporting pleated filter media

HUBERTY JOHN S

Filter cartridge having a magenta netting

PORBENI FRANCIS E

Filter frame assembly with seal