1
Daniel A Japuntich: High efficiency respirator. Minnesota Mining and Manufacturing Company, Donald M Sell, Walter N Kirn, Roger R Tamte, May 9, 1989: US04827924 (93 worldwide citation)

The invention provides a filtration face mask which has an expanded filtration surface area and high filter efficiency. The mask includes at least two sidewall portions generally extending away from the face of the wearer and away from an annular base. A frontal portion bridges the sidewall portions ...


2
Gerald M Brostrom, Daniel A Japuntich, Sabrina M Yard: Filter element. Minnesota Mining and Manufacturing Company, Donald M Sell, Walter N Kirn, Eloise J Maki, December 12, 1989: US04886058 (77 worldwide citation)

A filter element adapted for attachment to a respirator face piece which includes front and rear walls of filter material, a breather tube, and a porous inner layer which maintains the front and rear walls in a spaced-apart relationship over substantially their entire area and which functions to eve ...


3
Daniel A Japuntich, Vaughn B Grannis, Harold J Seppala, Anthony B Ferguson: Unidirectional fluid valve. Minnesota Mining and Manufacturing Company, Gary L Griswold, Walter N Kirn, Karl G Hanson, July 5, 1994: US05325892 (72 worldwide citation)

An exhalation valve 14 for a filtering face mask 10 has a flexible flap 24 that makes contact with a curved seal ridge 30 of a valve seat 26 when the valve 14 is in the closed position. The curvature of the seal ridge 30 corresponds to a deformation curve exhibited by the flexible flap 24 when secur ...


4
Daniel A Japuntich, Nicole V McCullough, Jane K Peterson, Nicholas R Baumann, John W Bryant, Christopher P Henderson, Bruce E Penning: Face mask that has a filtered exhalation valve. 3M Innovative Properties Company, Karl G Hanson, July 1, 2003: US06584976 (62 worldwide citation)

A filtering face mask that covers at least the nose and mouth of a wearer and that includes an exhalation valve. The exhalation valve opens in response to increased pressure when the wearer exhales to allow the exhaled air to be rapidly purged from the mask interior. An exhale filter element is plac ...


5
John J Emmel, Daniel A Japuntich, Lynette M Miles, James E Nash: Light tube. 3M Innovative Properties Company, George W Jonas, January 28, 2003: US06511204 (49 worldwide citation)

A light tube for use over a light element, wherein the light tube comprises an elongated, generally tubular body having a first end, a second end, a length between the first and second ends, and a longitudinal axis extending from the first end to the second end, a longitudinal slot extending general ...


6

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Daniel A Japuntich, Vaughn B Grannis, Harold J Seppala, Anthony B Ferguson: Unidirectional fluid valve. Minnesota Mining and Manufacturing Company, Gary L Griswold, Walter N Kirn, Karl G Hanson, April 23, 1996: US05509436 (28 worldwide citation)

An exhalation valve 14 for a filtering face mask 10 has a flexible flap 24 that makes contact with a curved seal ridge 30 of a valve seat 26 when the valve 14 is in the closed position. The curvature of the seal ridge 30 corresponds to a deformation curve exhibited by the flexible flap 24 when secur ...


8
Daniel A Japuntich: Method of forming a high efficiency respirator. Minnesota Mining and Manufacturing Company, Donald M Sell, Walter N Kirn, Roger R Tamte, November 28, 1989: US04883547 (27 worldwide citation)

The invention provides a filtration face mask which has an expanded filtration surface area and high filter efficiency. The mask includes at least two sidewall portions generally extending away from the face of the wearer and away from an annular base. A frontal portion bridges the sidewall portions ...


9
Daniel A Japuntich, Vaughn B Grannis, Harold J Seppala, Anthony B Ferguson: Filtering face mask that has a new exhalation valve. 3M Innovative Properties Company, Karl G Hanson, February 15, 2005: US06854463 (23 worldwide citation)

Filtering face mask 10 has a mask body 12 and an exhalation valve 14. The mask body 12 is adapted to fit over the nose and mouth of a person, and the exhalation valve 14 is attached to the mask body 12. The exhalation valve 14 has a valve seat 26 and a single flexible flap 24. The valve seat 26 incl ...


10
Daniel A Japuntich, Vaughn B Grannis, Harold J Seppala, Anthony B Ferguson: Filtering face mask that has a new exhalation valve. 3M Innovative Properties Company, Karl G Hanson, January 18, 2005: US06843248 (21 worldwide citation)

A filtering face mask that comprises a mask body that is adapted to fit over the nose and mouth of a wearer, the mask body comprising a filtration layer through which inhaled air may pass before being inhaled by a wearer of the face mask; and an exhalation valve that is attached to the mask body, th ...