Kevin A Rudolph: Mask for breath analysis. Hans Rudolph, Litman McMahon & Brown, November 30, 1993: US05265595 (230 worldwide citation)

An oral respiratory mouth mask for breath-by-breath ventilatory measurements on humans constructed of silicone or like material. The mouth mask has a curved face sealing flange adapted to sealably engage the user's skin about the mouth and nose including an internal mouth-enclosing chamber having a ...

Kevin A Rudolph: Nasal mask. Hans Rudolph, John C McMahon, February 27, 2001: US06192886 (215 worldwide citation)

A nasal mask configured to be as unobtrusive as possible while providing an air-tight seal around the nose of a wearer comprises a flexible nasal cup having a nasal opening formed by an inner circumferential edge or rim thereof and opening into a nasal chamber. The cup also includes inner and outer ...

Kevin A Rudolph: Airflow delivery system. Hans Rudolph, Litman McMahon and Brown, July 23, 1996: US05538000 (186 worldwide citation)

An improved airflow delivery system wherein a primary conduit extends from a source of a stream of breathable gas to a patient or wearer. The primary conduit is rotatably connected to a manifold positioned on the top of the wearer's head. The manifold distributes the stream of breathable gas through ...

Kevin A Rudolph, Kelly H Rudolph: Mask with gel seal. Hans Rudolph, John C McMahon, Litman Kraai & Brown L L C, July 4, 2000: US06082360 (119 worldwide citation)

An apparatus includes a respiratory mask and a seal. The mask is adapted to encircle the mouth of a user and convey gasses to and from the mouth of a user through a port therein. The seal is a hydrogel seal that is relatively sticky and resilient so as to provide a tight seal between the mask and th ...

Kevin A Rudolph: Pneumotach. Hans Rudolph, Litman McMahon & Brown, October 29, 1991: US05060655 (37 worldwide citation)

A pneumotach apparatus for measuring gas flows comprises a flow head with a passageway and having a plurality of screens positioned in the pasageway to provide a variance in pressure on different sides of one of the screens, a pressure transducer to convert the pressures into a flow value and a disp ...

Kevin A Rudolph: Ventilation mask with continuous seal connected by resilient cushion. Hans Rudolph, Erickson Kernell Derusseau & Kleypas, March 20, 2012: US08136523 (8 worldwide citation)

A respiratory mask comprises a sealing flange connected to a mask body by a sinusoidal shaped cushioning member. The cushioning member resiliently compresses when the sealing flange is pressed against the face of a wearer to ensure an airtight seal between the sealing flange and the face of the wear ...