Karl Allan Ingard

52092593, May 11, 1993

Jan 15, 1991

7/641402

Terrence A. Dear - Elkton MD
Karl U. Ingard - Kittery Point ME

E. I. Du Pont de Nemours and Company - Wilmington DE

F16K 4700
F16K 4708

137561A

A fluid distribution system, such as a valve, comprises a housing having a chamber which has a plurality of acoustic modes. The acoustic modes are excited when fluid flows through the chamber. An inlet passage and an outlet passage are disposed in fluid communication with the chamber. A plate is disposed in the inlet passage. A plurality of orifices are formed in the plate. The orifices conduct fluid from the inlet passage to the chamber and reduce the coupling between the flow of fluid through the inlet passage and the acoustic modes of the chamber. With this arrangement, the acoustic modes of the chamber and the resonance frequency of each of the orifices are substantially unexcited by the flow of fluid through the orifices.

50148168, May 14, 1991

Nov 9, 1989

7/434959

Terrence A. Dear - Elkton MD
Karl U. Ingard - Kittery Point ME
Mark E. Schuchardt - Pleasant Ridge MI

E. I. du Pont de Nemours and Company - Wilmington DE

E02M 3500

181229

A silencer having multiple integrated channels arranged in a labyrinth configuration is provided. The channels have one open end and one closed end with the open end in communication with a common zone which is connected to a flow duct. The channels are tuned to provide a selected resonance frequency.

43600751, Nov 23, 1982

May 11, 1981

6/262464

Dwight A. Blaser - Sterling Heights MI
David J. Goding - Willow Springs IL
Karl U. Ingard - Kittery Point ME

General Motors Corporation - Detroit MI

F01N 102
F01N 108

181250

An exhaust silencer especially for turbo-charged diesel locomotives with a single exhaust outlet combines a straight through exhaust duct preferably diverging to recover velocity pressure and minimize back pressure with dual silencing means including a large expansion tank around the duct tuned to attenuate a fundamental low frequency exhaust noise peak and smaller reactive chambered means in the duct sized to attenuate a selected mid range of higher frequency exhaust noise. Various features are included.

48321478, May 23, 1989

Jun 19, 1987

7/067723

Terrence A. Dear - Elkton MD
Karl U. Ingard - Kittery Point ME
Stephen P. Scheinberg - Wilmington DE

E. I. DuPont de Nemours and Company - Wilmington DE

E04B 182

181 30

A volumetric sound absorber for audible sound frequencies is made from a thin sheet material that is permeable to air with thickness mass, and flow resistance within specified ranges.

44187882, Dec 6, 1983

Apr 13, 1981

6/253270

Dimiter Gorchev - Boston MA
Karl U. Ingard - Kittery Point ME
Herbert L. Willke - Cambridge MA

Mitco Corporation - Somerville MA

E04F 1704

181224

Disclosed is a composite branch take-off and silencer for an air distribution system wherein an air stream from an input duct may be coupled to an output duct and one or more branch ducts. The take-off and silencer includes two series-coupled sections: a static pressure regain section and a channel section adapted for coupling the input duct to the output duct and the branch ducts. The static pressure regain section outer wall and the outer path-defining wall of the associated channel section have a composite cross section characterized by a continuous curve which results in smooth changes in air flow velocity without discontinuity in either magnitude or direction thereby providing efficient conversion of velocity pressure to static pressure. These continuous curves have a direction component along their length which is increasingly directed radially from the central axis of the input duct. The composite branch take-off and silencer promotes excellent air distribution while substantially reducing the noise normally associated with these systems.

41824300, Jan 8, 1980

Sep 20, 1978

5/944133

Dimiter Gorchev - Boston MA
Karl U. Ingard - Kittery Point ME

Mitco Corporation - Somerville MA

E04F 1704

181224

A branch take-off and silencer apparatus for an air distribution system. The apparatus couples an input duct to one or more branch ducts and to a coaxial output duct having a similar but smaller cross-section than the input duct. Coaxial extensions of the input and output ducts define a shell region. The shell region is closed at its downstream end and open at its upstream end to oncoming air in the input duct. The shell region is divided at that upstream end by porous acoustical material into a plurality of adjacent channels which lead to a plenum near the downstream end of the shell region. The plenum is coupled to the branch ducts.

42954169, Oct 20, 1981

Sep 20, 1978

5/944134

Dimiter Gorchev - Boston MA
Karl U. Ingard - Kittery Point ME
Herbert L. Willke - Cambridge MA

Mitco Corporation - Somerville MA

F24F 1300

98 33R

An air distribution system for a building including a mixing plenum for receiving and mixing outside and return air. An input flow concentrator and integral silencer is disposed within and coupled to the mixing plenum. The flow concentrator and integral silencer is adapted to establish a substantially axially symmetrical flow path for air from the plenum to an output port. A fan is coupled to the output port to drive the air from the output port to the main duct for distribution throughout the building.

43135226, Feb 2, 1982

Sep 10, 1979

6/073604

Dimiter Gorchev - Boston MA
Karl U. Ingard - Kittery Point ME

Mitco Corporation - Somerville MA

E04F 1704

181224

A static pressure regain coupler for coupling an input duct and the upstream end of a branch take-off device having a main duct and one or more channel. The static pressure regain (SPR) coupler includes an upstream end which has substantially the same cross-section as the input duct. The SPR coupler also includes a downstream end which has a first port having the same cross-section as the main duct of the take-off device, and a second port having substantially the same cross-section as the channels of the take-off device. The SPR coupler is adapted to couple most of the input airflow to the take-off main duct, and a minor portion of that air flow to the take-off channels.