Growing community of inventors

Sioux Falls, SD, United States of America

Mark D Johnson

Average Co-Inventor Count = 1.43

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 = 216

Mark D JohnsonVladimir Bittner (2 patents)Mark D JohnsonGeorge Spector (1 patent)Mark D JohnsonMark D Johnson (5 patents)Vladimir BittnerVladimir Bittner (3 patents)George SpectorGeorge Spector (695 patents)
..
Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Other (2 from 832,812 patents)

2. The Brigham and Women's Hospital, Inc. (2 from 1,373 patents)


5 patents:

1. D841559 - Lift tool box

2. 9988186 - Tool storage device

3. 5304141 - Method and apparatus for inducing anesthesia

4. 5232442 - Method and apparatus for inducing anesthesia

5. 4741176 - Beverage cooler

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as of
12/21/2025
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