Harold J. Seppala

Person

St. Paul, MN, US

People

Patents Grantslast 30 patents

Information Patent Grant
Fibrous filtration face mask having a new unidirectional fluid valve
- Patent number 7,493,900
- Issue date Feb 24, 2009
- 3M Innovative Properties Company
- Daniel A. Japuntich
- A62 - LIFE-SAVING FIRE-FIGHTING
Information Patent Grant
Fibrous filtration face mask having a new unidirectional fluid valve
- Patent number 7,428,903
- Issue date Sep 30, 2008
- 3M Innovative Properties Company
- Daniel A. Japuntich
- A62 - LIFE-SAVING FIRE-FIGHTING
Information Patent Grant
Method of making a filtering face mask that has an exhalation valve
- Patent number 7,311,104
- Issue date Dec 25, 2007
- 3M Innovative Properties Company
- Daniel A. Japuntich
- A62 - LIFE-SAVING FIRE-FIGHTING
Information Patent Grant
Fibrous filtration face mask having a new unidirectional fluid valve
- Patent number 7,117,868
- Issue date Oct 10, 2006
- 3M Innovative Properties Company
- Daniel A. Japuntich
- A62 - LIFE-SAVING FIRE-FIGHTING
Information Patent Grant
Filtering face mask that has a new exhalation valve
- Patent number 6,854,463
- Issue date Feb 15, 2005
- 3M Innovative Properties Company
- Daniel A. Japuntich
- A62 - LIFE-SAVING FIRE-FIGHTING
Information Patent Grant
Filtering face mask that has a new exhalation valve
- Patent number 6,843,248
- Issue date Jan 18, 2005
- 3M Innovative Properties Company
- Daniel A. Japuntich
- A62 - LIFE-SAVING FIRE-FIGHTING
Information Patent Grant
Multi-part headband and respirator mask assembly and process for ma...
- Patent number 6,148,817
- Issue date Nov 21, 2000
- 3M Innovative Properties Company
- John W. Bryant
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Elastomeric composite headband
- Patent number 6,070,579
- Issue date Jun 6, 2000
- 3M Innovative Properties Company
- John W. Bryant
- A41 - WEARING APPAREL
Information Patent Grant
Multi-part headband and respirator mask assembly and process for ma...
- Patent number 5,724,677
- Issue date Mar 10, 1998
- Minnesota Mining and Manufacturing Company
- John W. Bryant
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Unidirectional fluid valve
- Patent number 5,509,436
- Issue date Apr 23, 1996
- Minnesota Mining and Manufacturing Company
- Daniel A. Japuntich
- A62 - LIFE-SAVING FIRE-FIGHTING
Information Patent Grant
Oil, water and sweat repellent microporous membrane materials
- Patent number 5,352,513
- Issue date Oct 4, 1994
- Minnesota Mining and Manufacturing Company
- James S. Mrozinski
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Unidirectional fluid valve
- Patent number 5,325,892
- Issue date Jul 5, 1994
- Minnesota Mining and Manufacturing Company
- Daniel A. Japuntich
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Oil, water and sweat repellent microporous membrane materials
- Patent number 5,260,360
- Issue date Nov 9, 1993
- Minnesota Mining and Manufacturing Company
- James S. Mrozinski
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Article for liquid containment and recovery
- Patent number 5,256,466
- Issue date Oct 26, 1993
- Minnesota Mining and Manufacturing Company
- Michael R. Berringan
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Respirator harness assembly
- Patent number 5,237,986
- Issue date Aug 24, 1993
- Minnesota Mining and Manufacturing Company
- Harold J. Seppala
- A41 - WEARING APPAREL
Information Patent Grant
Adherent protective collars
- Patent number 4,980,927
- Issue date Jan 1, 1991
- Minnesota Mining and Manufacturing Company
- Alex A. Wawiluk
- A45 - HAND OR TRAVELLING ARTICLES

Patents Applicationslast 30 patents

Information Patent Application
Method Of Making A Filtering Face Mask Having New Exhalation Valve
- Publication number 20070119459
- Publication date May 31, 2007
- 3M Innovative Properties Company
- Daniel A. Japuntich
- A62 - LIFE-SAVING FIRE-FIGHTING
Information Patent Application
UNIDIRECTIONAL FLUID VALVE
- Publication number 20030084902
- Publication date May 8, 2003
- DANIEL A. JAPUNTICH
- A62 - LIFE-SAVING FIRE-FIGHTING
Information Patent Application
Filtering face mask that has a new exhalation valve
- Publication number 20020185133
- Publication date Dec 12, 2002
- Daniel A. Japuntich
- A62 - LIFE-SAVING FIRE-FIGHTING
Information Patent Application
Filtering face mask that has a new exhalation valve
- Publication number 20020170563
- Publication date Nov 21, 2002
- Daniel A. Japuntich
- A62 - LIFE-SAVING FIRE-FIGHTING

Harold J. Seppala

Person

Patents Grantslast 30 patents

Fibrous filtration face mask having a new unidirectional fluid valve

Fibrous filtration face mask having a new unidirectional fluid valve

Method of making a filtering face mask that has an exhalation valve

Fibrous filtration face mask having a new unidirectional fluid valve

Filtering face mask that has a new exhalation valve

Filtering face mask that has a new exhalation valve

Multi-part headband and respirator mask assembly and process for ma...

Elastomeric composite headband

Multi-part headband and respirator mask assembly and process for ma...

Unidirectional fluid valve

Oil, water and sweat repellent microporous membrane materials

Unidirectional fluid valve

Oil, water and sweat repellent microporous membrane materials

Article for liquid containment and recovery

Respirator harness assembly

Adherent protective collars

Patents Applicationslast 30 patents

Method Of Making A Filtering Face Mask Having New Exhalation Valve

UNIDIRECTIONAL FLUID VALVE

Filtering face mask that has a new exhalation valve

Filtering face mask that has a new exhalation valve