For the Inventor, By the Inventor

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Ft. Worth, TX, United States of America

Special Projects Manufacturing, Inc.

USPTO Granted Patents = 2

Trademarks = 1

Forward Citations = 51

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5 inventors (with patents filed for the assignee):

Mark D Matzner (1 out of 25 patents)

Donald L Douglas (1 out of 3 patents)

Jimmie L Yeary (1 out of 1 patent)

4. Dan E Lowrance (1 out of 2 patents)

5. David W Merryfield (1 out of 2 patents)

2 patents: Sort by Forward Citations

1. 5246355 - Well service pumping assembly (1993-09-21),

2. 4889259 - Apparatus for injecting balls into a well (1989-12-26),

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USPTO Data Jan 1 1976 - Dec 23 2025

2 Patents

#17 in Ft. Worth, TX

#6,128 in Texas

#92,558 in US

Ft. Worth, TX, United States of America

Special Projects Manufacturing, Inc.

Forward Citations = 51

5 inventors:

Mark D Matzner (1 out of 25 patents)

Donald L Douglas (1 out of 3 patents)

Jimmie L Yeary (1 out of 1 patent)

4. Dan E Lowrance (1 out of 2 patents)

5. David W Merryfield (1 out of 2 patents)

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