Growing community of inventors

Sioux Falls, SD, United States of America

David M Christensen

Average Co-Inventor Count = 3.00

ph-index = 4

The patent ph-index is calculated by counting the number of publications for which an author has been cited by other authors at least that same number of times.

Forward Citations = 162

David M ChristensenBruce Dresner (3 patents)David M ChristensenScott G Schulte (2 patents)David M ChristensenDonald P Rigney (1 patent)David M ChristensenCorbit Beasey (1 patent)David M ChristensenChristopher L Flick (1 patent)David M ChristensenBernard A Lauzon (1 patent)David M ChristensenRobert B Zahm (1 patent)David M ChristensenDaniel J Sovar (1 patent)David M ChristensenWayne E Thuenemann (1 patent)David M ChristensenJohn A Hart (1 patent)David M ChristensenFrank D Wurth (1 patent)David M ChristensenJohn A Schweiss (1 patent)David M ChristensenFrank Wurth (1 patent)David M ChristensenDavid M Christensen (7 patents)Bruce DresnerBruce Dresner (3 patents)Scott G SchulteScott G Schulte (2 patents)Donald P RigneyDonald P Rigney (5 patents)Corbit BeaseyCorbit Beasey (2 patents)Christopher L FlickChristopher L Flick (2 patents)Bernard A LauzonBernard A Lauzon (1 patent)Robert B ZahmRobert B Zahm (1 patent)Daniel J SovarDaniel J Sovar (1 patent)Wayne E ThuenemannWayne E Thuenemann (1 patent)John A HartJohn A Hart (1 patent)Frank D WurthFrank D Wurth (1 patent)John A SchweissJohn A Schweiss (1 patent)Frank WurthFrank Wurth (1 patent)
..
Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Empire Comfort Systems, Inc. (6 from 13 patents)

2. American Hearth Systems, Inc. (1 from 2 patents)


7 patents:

1. 11156383 - High efficiency heater with condensate collection and humidification

2. 10072872 - High efficiency heater with condensate collection and humidification

3. 9062881 - Control system for space heater/hearth

4. 6945160 - Outdoor cooker and smoker apparatus

5. 6463926 - Direct vent fireplace with baffled, directional exhaust and vent air column

6. 6314868 - Direct and indirect outdoor cooker

7. 6269737 - Food cooking apparatus

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as of
12/19/2025
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