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Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Inventor:
Braun; David L.
Address:
Lake Elmo, MN
No. of patents:
20
Patents:












Patent Number Title Of Patent Date Issued
6216693 Respirator having a compressible press fir filter element April 17, 2001
A respirator 10 includes a compressible filter element 12, a filter element retainer 14, and a face piece 16. The respirator is unique in that the filter element 12 compresses when installed in the retainer 14, allowing a friction fit to be maintained between the filter element 12 and re
5976220 Diffusional gas transfer system and method using same November 2, 1999
A diffusional gas transfer system and method having a membrane disposed between a first gas domain and a second gas domain. The first gas domain includes a first mechanism for directing a first environmental gas flow transversely over and in contact with a first surface of the membrane.
5961778 Corrugating apparatus October 5, 1999
Corrugating apparatus that includes paddles and an ultrasonic welding device. The paddles are attached at one end to a transport that moves about a path. The paddles extend radially from the transport, and each paddle has a free end that is capable of supporting a web as the paddles
5955193 Apparel containing corrugated microfiber-containing thermal insulation September 21, 1999
Apparel having thermal insulation containing a corrugated nonwoven web and a means for retaining the shape of a corrugated web. The shape-retaining means is not coextensive with the corrugated nonwoven web and is secured to the valleys of the corrugations. The corrugated nonwoven web has
5830311 Corrugating apparatus November 3, 1998
Corrugating apparatus that includes paddles and an ultrasonic welding device. The paddles are attached at one end to a belt that moves about a path. The paddles extend radially from the belt, and each paddle has a free end that supports a web as the paddles move about the path. The free
5804295 Fibrous filtration face mask having corrugated polymeric microfiber filter layer September 8, 1998
A composite structure contains a lofty corrugated nonwoven web of polymeric microfiber that is maintained in a corrugated condition by securing a fabric to the corrugated web at the valleys of the corrugations. The composite structure is made without substantially effecting web loft by
5763078 Filter having corrugated nonwoven webs of polymeric microfiber June 9, 1998
A filter that is capable of removing particulate and gaseous contaminants from a fluid, which filter comprises:a first filter element that is capable of removing particulate contaminants from a fluid, the first filter element comprising a corrugated nonwoven web of polymeric microfiber h
5753343 Corrugated nonwoven webs of polymeric microfiber May 19, 1998
A composite structure contains a lofty corrugated nonwoven web of polymeric microfiber that is maintained in a corrugated condition by securing a fabric to the corrugated web at the valleys of the corrugations. The composite structure is made without substantially effecting web loft by
5656368 Fibrous filtration face mask having corrugated polymeric microfiber filter layer August 12, 1997
A composite structure contains a lofty corrugated nonwoven web of polymeric microfiber that is maintained in a corrugated condition by securing a fabric to the corrugated web at the valleys of the corrugations. The composite structure is made without substantially effecting web loft by
5639700 Thermal insulation containing corrugated nonwoven web of polymeric microfiber June 17, 1997
Thermal insulation contains a corrugated nonwoven web and a means for retaining the shape of a corrugated web. The shape-retaining means is not coextensive with the corrugated nonwoven web and is secured to the valleys of the corrugations. The corrugated nonwoven web has a solidity of 0.
5620545 Method of making a corrugated nonwoven web of polymeric microfiber April 15, 1997
A method of making a corrugated nonwoven web of polymeric microfiber, which method comprises:(a) introducing a nonwoven web of polymeric microfiber having a solidity of 0.1 or less into a corrugating apparatus that has a plurality of paddles secured at a first end to a means for moving t
5078132 Bonded adsorbent structures and respirators incorporating same January 7, 1992
Shaped porous filtering structures of substantially uniform thickness and density particularly suited for filtration of gases and vapors comprising spaced adsorbent granules unified into a solid, self-sustaining, unitary, impact-resistant body by adherent binder particles, respirators
5035240 Elastomeric filtration materials July 30, 1991
Elastomeric nonwoven fibrous fluid filter media for removal of particulate contaminants from the fluid are provided. The filter media comprises thermoplastic elastomeric melt-blown small diameter fibers, the small diameter fibers being randomly arrayed, the filter media having substa
4790306 Respiratory mask having a rigid or semi-rigid, insert-molded filtration element and method of ma December 13, 1988
A filtering device is made by inserting into an injection mold a porous, rigid or semi-rigid filtration element that has inflow and outflow faces separated by a peripheral surface and then injecting resin into the flow channel of the mold at a pressure and temperature such that the resin
4583911 Multiple fluid pathway energy converter April 22, 1986
An axial flow energy converter combining a tubular shroud defining a fluid pathway coaxial with the shroud, a rotational energy converter having a rotatable shaft mounted within the fluid pathway coaxial with the shroud, an impeller mounted to the shaft with the impeller having a hub hav
4462399 Powered air respirator and cartridge July 31, 1984
A high efficiency rigid or semi-rigid air filter cartridge for use in the helmet of a powered air respirator comprising a lightweight, open-topped, trough-shaped frame having an entrance at one end for attachment to an air discharge port of a fan motor housing assembly, filter media seal
4158958 Controlled sensitivity monitoring devices June 26, 1979
A controlled sensitivity device for measuring the amount of a selected component in fluid mixture is disclosed. A collecting layer is disposed within a chamber into which the fluid mixture is allowed to diffuse. Sensitivity of the device is controlled by varying the ratio of the cham
4102201 Vapor sampling and analytical device July 25, 1978
A device and method for collecting selected components of a fluid mixture such as ambient air are disclosed. A chamber formed by wall members and having an open end contains a layer of collecting material on the bottom thereof and a porous layer covering the open end. After this device h
3971373 Particle-loaded microfiber sheet product and respirators made therefrom July 27, 1976
A self-supporting durable flexible conformable low-pressure-drop porous sheet product that contains a uniform three-dimensional arrangement of discrete solid particles. This sheet product comprises, in addition to the particles, a web of melt-blown microfibers in which the particles are
3950980 Vapor sampling device April 20, 1976
A device for measuring the presence or time-average amounts of at least one selected gas in a mixture thereof which comprises an enclosure having therewithin at least one substance which interacts with the gas to be monitored. Attenuating means associated with the enclosure regulate gas










 
 
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