1
Philip C Efthimion, Dennis J Helfritch: Apparatus and method for enhanced chemical processing in high pressure and atmospheric plasmas produced by high frequency electromagnetic waves. Research Cottrell, Kerkam Stowell Kondracki & Clarke, November 28, 1989: US04883570 (57 worldwide citation)

An apparatus and method for creating high temperature plasmas for enhanced chemical processing of gaseous fluids, toxic chemicals, and the like, at a wide range of pressures, especially at atmospheric and high pressures includes an electro-magnetic resonator cavity, preferably a reentrant cavity, an ...


2
Edward J Gonas, Dennis J Helfritch: Electrostatic dust collector. American Precision, Christel & Bean, April 3, 1979: US04147522 (51 worldwide citation)

A method and apparatus for separating particulate matter from a gas stream wherein dirty gas is moved through an electrostatic charging zone such as an electrostatic precipitator and then is moved through a filter of foraminous material such as a fabric filter of the bag type. The filter is in fluid ...


3
Paul L Feldman, Dennis J Helfritch: Method for enhancing collection efficiency and providing surface sterilization of an air filter. Enviromental Elements, Rosenberg Klein & Lee, June 12, 2001: US06245126 (44 worldwide citation)

A method of filtering air includes the steps of providing a filter element, providing a pair of electrodes sandwiching the filter element, applying a DC electrostatic field to the electrodes to produce attracting forces between particulates and micro-organisms contained in the air and the filter ele ...


4
Dennis J Helfritch, Edward J Gonas: Electrostatically augmented cartridge type dust collector and method. American Precision, Christel Bean & Linihan, November 2, 1982: US04357151 (35 worldwide citation)

A method and apparatus for separating particulate matter from a gas stream wherein dirty gas is moved first through a corona discharge zone, such as that provided by a plurality of rod-like electrodes each having a sharp-edged corona producing ribbon-like formation extending axially therealong, and ...


5
Paul L Feldman, Dennis J Helfritch: Air filter with combined enhanced collection efficiency and surface sterilization. Environmental Elements, Rosenberg Klein & Lee, June 12, 2001: US06245132 (29 worldwide citation)

Electrically enhanced filter, includes a filter element, a pair of electrodes sandwiching the filter element, a DC, AC, pulse, or RF power supply coupled to the electrode to create an electrostatic field across the filter element and to produce attracting forces between micro-organisms contained in ...


6
Dennis J Helfritch: Catalytic reactor for oxidizing mercury vapor. Environmental Elements, Rosenberg Klein & Bilker, July 28, 1998: US05785932 (25 worldwide citation)

A catalytic reactor (10) for oxidizing elemental mercury contained in flue gas is provided. The catalyst reactor (10) comprises within a flue gas conduit a perforated corona discharge plate (30a, b) having a plurality of through openings (33) and a plurality of projecting corona discharge electrodes ...


7
Dennis J Helfritch: Process for removing SO.sub.2 and fly ash from flue gas. Research Cottrell, Kerkam Stowell Kondracki & Clarke, October 2, 1990: US04960445 (8 worldwide citation)

A process is disclosed for enhanced removal of SO.sub.2 and fly ash from flue gas by directing the flue gas and an SO.sub.2 sorbent through an electrostatic charger and then through a bag filter where electrostatically improved flue gas/sorbent contact occurs and where the suspended fly ash and sodi ...


8
Dennis J Helfritch, Philip C Efthimion: Removal of nitrogen oxides from waste gases. Research Cottrell, Kerkam Stowell Kondracki & Clarke, January 15, 1991: US04985219 (8 worldwide citation)

A method for the removal of nitrogen oxides from waste gases by contacting the waste gas with the products of the pyrolytic decomposition of methane containing CH and CH.sub.2 radicals to reduce the nitrogen oxides to nitrogen.


9
Dennis J Helfritch: Radiation for the selective destruction of toxic molecules on solid surfaces. Research Cottrell, Kerkam Stowell Kondracki & Clarke, May 23, 1989: US04832806 (6 worldwide citation)

A method is disclosed for the distruction of toxic materials adsorbed on large masses of non-toxic materials by subjecting a mixture of the materials to a high power electron beam or to gamma rays.


10
Dennis J Helfritch: Method for nitrogen oxide reduction and flue gas reheating. Research Cottrell, Howrey & Simon, May 25, 1993: US05213780 (4 worldwide citation)

The present invention pertains to a method for nitrogen oxide reduction and flue gas reheating wherein a catalyst surface is heated to an operating temperature to facilitate a catalytic reduction reaction in the presence of relatively cool flue gas. To avoid conventional complication the catalytic r ...