4. Recording, communication, or information retrieval equipment
  5. Video or audio transmission, recording or playback equipment
  6. Video

Douglas J. Pfaff

Inventor

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Film cassette

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Video
Patent

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Lens protector device

Optical: systems and elements – Compound lens system – Microscope
Patent

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Medium-handling in printer for donor and receiver mediums

Typewriting machines – Sheet or web – Including friction-feed means
Reexamination Certificate

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Variable torque device for maintaining constant web tension

Electrophotography – Image formation – Fixing
Reexamination Certificate

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Profile ID: LFUS-PAI-P-602779

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