For the Inventor, By the Inventor

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West Hartford, CT, United States of America

Dunham-bush

USPTO Granted Patents = 47

Trademarks = 6

Forward Citations = 1,095

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28 inventors (with patents filed for the assignee):

David N Shaw (28 out of 51 patents)

Donald D Schaefer (6 out of 6 patents)

Joseph A Gagnon (4 out of 4 patents)

4. Steven W Paul (2 out of 2 patents)

5. Clifford T Bulkley (2 out of 2 patents)

6. Sebastian J Gianni (2 out of 2 patents)

7. David J First (1 out of 3 patents)

8. Robert A Ingalls (1 out of 7 patents)

9. Joseph S Orosz (1 out of 1 patent)

10. Anthony J Bianco (1 out of 1 patent)

11. Daryl K Showalter (1 out of 1 patent)

12. Warren H Dillenbeck (1 out of 1 patent)

13. James W Oliver, Jr (1 out of 1 patent)

14. Leonard H Schwarz (1 out of 1 patent)

15. Eugene E O'Neil (1 out of 1 patent)

Core Competencies:

Heat Exchanger

Helical Screw Rotary Compressor

Variable Volume Pump

Oil Equalization System

Temperature Control System

Solar Augmented Heat Pump

Compressor Refrigeration System

Integrated Thermal Solar Heat Pump

Feedback Control System

Turbulator

Constant Volume Flow Burner

Screw Compressor

47 patents: Sort by Forward Citations

1. 5423378 - Heat exchanger element and heat exchanger using same (1995-06-13),

2. 4909716 - Screw step drive internal volume ratio varying system for helical screw (1990-03-20),

3. 4727907 - Turbulator with integral flow deflector tabs (1988-03-01),

4. 4647801 - Electric motor back-stopping device (1987-03-03),

5. 4585169 - Constant volume flow burner fuel control system (1986-04-29),

6. 4583373 - Constant evaporator pressure slide valve modulator for screw compressor (1986-04-22),

7. 4545742 - Vertical axis hermetic helical screw rotary compressor with discharge (1985-10-08),

8. 4536130 - Simplified unloader indicator for helical screw rotary compressor (1985-08-20),

9. 4527967 - Screw rotor machine with specific tooth profile (1985-07-09),

10. 4508491 - Modular unload slide valve control assembly for a helical screw rotary (1985-04-02),

11. 4497185 - Oil atomizing compressor working fluid cooling system for (1985-02-05),

12. 4495778 - Temperature and pressure actuated capacity control system for air (1985-01-29),

13. 4478054 - Helical screw rotary compressor for air conditioning system having (1984-10-23),

14. 4477233 - Vertical axis hermetic helical screw rotary compressor with discharge (1984-10-16),

15. 4439121 - Self-cleaning single loop mist type lubrication system for screw (1984-03-27),

Dunham-Bush is a global company specializing in the manufacturing and distribution of heating, ventilating, and air conditioning (HVAC) equipment. With over a century of experience, Dunham-Bush offers a wide range of innovative and energy-efficient HVAC solutions for various industries, including commercial, industrial, and residential sectors. Their offerings include cooling units, heat pumps, air handling units, and chillers. As a recognized leader in the industry, Dunham-Bush focuses on providing reliable and sustainable solutions to meet the ever-evolving needs of the market.

This text is generated by artificial intelligence and may not be accurate.

Company Badge

USPTO Data Jan 1 1976 - Dec 30 2025

47 Patents

#3 in West Hartford, CT

#173 in Connecticut

#7,187 in US

#14,403 in the World

West Hartford, CT, United States of America

Dunham-bush

Forward Citations = 1,095

28 inventors:

David N Shaw (28 out of 51 patents)

Donald D Schaefer (6 out of 6 patents)

Joseph A Gagnon (4 out of 4 patents)

4. Steven W Paul (2 out of 2 patents)

5. Clifford T Bulkley (2 out of 2 patents)

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