1
Klaus Willeke: Non-invasive quantitative method for fit testing respirators and corresponding respirator apparatus. University of Cincinnati, Frost & Jacobs, July 11, 1989: US04846166 (45 worldwide citation)

A method and apparatus for conducting the method is disclosed for non-invasive, quantitative respirator fit testing. The method includes the step of having the wearer properly position the respirator over his nose and mouth, inhale to create a negative pressure inside the respirator cavity volume, h ...


2
Benjamin Y H Liu, Richard C Jordan, Klaus Willeke: Solar heat collector. The Regents of the University of Minnesota, Burd Braddock & Bartz, April 5, 1977: US04015582 (24 worldwide citation)

A highly efficient solar heat collector characterized by a layer of light transmitting insulating (i.e., convection and infra-red radiation suppressing) material disposed between the outer surface of the collector and the heat absorptive layer thereof. Glass fibers are a particularly effective light ...


3
Klaus Willeke: Method for aerodynamic particle size analysis. Wood Herron & Evans L, September 7, 1999: US05949001 (20 worldwide citation)

A method is provided for measuring the aerodynamic particle size distribution of airborne particles by drawing the particles through a device which continuously or intermittently changes the aerodynamic cut of the particles entering an optical sensor. Optical sensing is performed by aerosol photomet ...


4
Donald A Masquelier, Fred P Milanovich, Klaus Willeke: High air volume to low liquid volume aerosol collector. The Regents of the University of California, L E Carnahan, Alan H Thompson, February 18, 2003: US06520034 (20 worldwide citation)

A high air volume to low liquid volume aerosol collector. A high volume flow of aerosol particles is drawn into an annular, centripetal slot in a collector which directs the aerosol flow into a small volume of liquid pool contained is a lower center section of the collector. The annular jet of air i ...


5
Klaus Willeke: Aerodynamic particle size analysis method and apparatus. Wood Herron & Evans L, June 25, 2002: US06408704 (19 worldwide citation)

A method and apparatus are provided for measuring the aerodynamic particle size distribution of airborne particles by drawing the particles through a device


6
Klaus Willeke: Method for concentrating airborne particles and microorganisms by their injection into a swirling air flow. SKC, William L Krayer, October 19, 1999: US05967332 (10 worldwide citation)

A method for concentrating airborne particles and microorganisms by injecting them into a swirling air flow from where they are removed into one or more receiving tubes. The swirling air motion and the aerosol injection into it are achieved by pushing or drawing the airborne particles and microorgan ...


7
Klaus Willeke, Xuejun Lin, Sergey Grinshpun: Swirling aerosol collector. SKC, William L Krayer, May 11, 1999: US05902385 (8 worldwide citation)

An apparatus for collecting airborne particles and microorganisms by injecting them into a swirling air flow from where they are removed onto a dry surface, a surface coated with an adhesive material or a surface wetted by a liquid that is swirled onto that surface from a liquid reservoir below. The ...


8
Klaus Willeke: Method for collecting airborne particles and microorganisms by their injection into a swirling air flow. SKC, William L Krayer, May 18, 1999: US05904752 (6 worldwide citation)

A method for collecting airborne particles and microorganisms by injecting them into a swirling air flow from where they are removed onto a dry surface, a surface coated with an adhesive material or a surface wetted by a liquid that is swirled onto that surface from a liquid reservoir below. The swi ...


9
Klaus Willeke, Sergey A Grinshpun: Method for sampling aerosols. SKC, William L Krayer, September 28, 1999: US05958111 (3 worldwide citation)

A method for the collection of solid or liquid particles suspended in air (aerosol). The method involves abstracting a quantity of air through a curved, porous plate with evenly spaced holes which are designed to give an accurate sample of the particle content over defined size ranges. This method d ...


10
Klaus Willeke, Sergey A Grinshpun: Apparatus for sampling aerosols. SKC, William L Krayer, September 21, 1999: US05954845 (2 worldwide citation)

An aerosol sampler for use with a source of vacuum. Air is drawn through a perforated hemisphere, directing small particles and aerosols for collection on a filter surface downstream of the hemisphere. A high collection efficiency is demonstrated.