Growing community of inventors

Yankton, SD, United States of America

David Joseph Schaefer

Average Co-Inventor Count = 1.98

ph-index = 5

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 = 64

David Joseph SchaeferSteven James Knight (4 patents)David Joseph SchaeferJerry Ray Dimmer (4 patents)David Joseph SchaeferNathan P Dimmer (3 patents)David Joseph SchaeferTroy Knouse (2 patents)David Joseph SchaeferKevin Kleinsasser (2 patents)David Joseph SchaeferMichael P Krajewski (2 patents)David Joseph SchaeferCarla K Ewald (2 patents)David Joseph SchaeferChristopher J McCallum (1 patent)David Joseph SchaeferKevin J Kleinsasser (1 patent)David Joseph SchaeferDerrick K Barr (1 patent)David Joseph SchaeferChristopher J Mccallum (1 patent)David Joseph SchaeferDavid Joseph Schaefer (8 patents)Steven James KnightSteven James Knight (16 patents)Jerry Ray DimmerJerry Ray Dimmer (10 patents)Nathan P DimmerNathan P Dimmer (3 patents)Troy KnouseTroy Knouse (4 patents)Kevin KleinsasserKevin Kleinsasser (3 patents)Michael P KrajewskiMichael P Krajewski (2 patents)Carla K EwaldCarla K Ewald (2 patents)Christopher J McCallumChristopher J McCallum (2 patents)Kevin J KleinsasserKevin J Kleinsasser (1 patent)Derrick K BarrDerrick K Barr (1 patent)Christopher J MccallumChristopher J Mccallum (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Astec Industries, Inc. (2 from 130 patents)

2. Shur Company (2 from 18 patents)

3. Strategic Rail Systems Company (2 from 2 patents)

4. Other (1 from 832,891 patents)

5. Shorma Company (1 from 2 patents)


8 patents:

1. 8869711 - Control system for rail car cover system

2. 8826827 - Rail car cover system

3. 8141498 - Rail car extension system

4. 7967363 - Rail car cover system

5. 7841642 - Retractable tarping system

6. 7823515 - Rail car cover system

7. 6336560 - Grizzly screening apparatus

8. 6098811 - Grizzly screening apparatus

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as of
12/30/2025
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