Growing community of inventors

Stuart, FL, United States of America

David Siebert

Average Co-Inventor Count = 1.23

ph-index = 2

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 = 11

David SiebertPortia Seely (3 patents)David SiebertDavid Siebert (8 patents)Portia SeelyPortia Seely (4 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Advantage Technology and Innovations, Inc. (7 from 10 patents)

2. Other (1 from 832,912 patents)


8 patents:

1. 9487021 - Adjustable stenographic keyboard device and method for electronically adjusting key depth sensitivity

2. 9211724 - Adjustable stenographic keyboard device and method for electronically adjusting key depth sensitivity

3. 9193174 - Device and method for identifying stacking and splitting of stenographic keystrokes

4. 8770872 - Adjustable stenographic keyboard device and method for electronically adjusting key depth sensitivity

5. 8480320 - Adjustable stenographic keyboard device and method for electronically adjusting key depth sensitivity

6. 8215853 - Device and method for identifying stacking and splitting of stenographic keystrokes

7. 8096714 - Stenographic keyboard device providing extended set of keys and method for electronically adjusting key depth sensitivity

8. 7572078 - Electronic key depth sensing device and method for interpreting keystroke levels of the device

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as of
1/10/2026
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