Growing community of inventors

Santa Barbara, CA, United States of America

David Frank Hofstatter

Average Co-Inventor Count = 4.06

ph-index = 15

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 = 1,245

David Frank HofstatterDavid S Trandal (34 patents)David Frank HofstatterLeland W Kirchhoff (24 patents)David Frank HofstatterRobert F Smith (17 patents)David Frank HofstatterRobert A Dolan (17 patents)David Frank HofstatterColin Denison Kelley (15 patents)David Frank HofstatterDavid J Brahm (14 patents)David Frank HofstatterDavid Giannini (8 patents)David Frank HofstatterDavid C McClintock (5 patents)David Frank HofstatterAnthony Bladon (5 patents)David Frank HofstatterRobert J Duva (3 patents)David Frank HofstatterJohn R Day (3 patents)David Frank HofstatterAdrian Van Haaften (3 patents)David Frank HofstatterEric Johnson (3 patents)David Frank HofstatterBob F Smith (3 patents)David Frank HofstatterLee Kirchhoff (2 patents)David Frank HofstatterDavid Frank Hofstatter (40 patents)David S TrandalDavid S Trandal (135 patents)Leland W KirchhoffLeland W Kirchhoff (59 patents)Robert F SmithRobert F Smith (38 patents)Robert A DolanRobert A Dolan (19 patents)Colin Denison KelleyColin Denison Kelley (54 patents)David J BrahmDavid J Brahm (52 patents)David GianniniDavid Giannini (16 patents)David C McClintockDavid C McClintock (19 patents)Anthony BladonAnthony Bladon (5 patents)Robert J DuvaRobert J Duva (15 patents)John R DayJohn R Day (8 patents)Adrian Van HaaftenAdrian Van Haaften (3 patents)Eric JohnsonEric Johnson (3 patents)Bob F SmithBob F Smith (3 patents)Lee KirchhoffLee Kirchhoff (2 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Callwave Communications, LLC (26 from 80 patents)

2. Callwave, Inc. (11 from 37 patents)

3. J2 Global Communications, Inc. (3 from 40 patents)


40 patents:

1. 9838542 - Methods and systems for managing communications

2. 9692891 - Methods and systems for blocking unwanted communications

3. 9686414 - Methods and systems for managing telecommunications and for translating voice messages to text messages

4. 9647978 - Methods and apparatus for providing expanded telecommunications service

5. 9491297 - Methods and systems for managing telecommunications

6. 9413885 - Methods and systems for blocking unwanted communications

7. 9319523 - Methods and apparatus for providing expanded telecommunications service

8. 9277043 - Methods and systems for managing telecommunications and for translating voice messages to text messages

9. 9258412 - Enhanced service levels for call-processing services

10. 8977248 - Methods and systems for managing telecommunications and for translating voice messages to text messages

11. 8958782 - Methods and systems for blocking unwanted communications

12. 8929258 - Enhanced service levels for call-processing services

13. 8891753 - Methods and apparatus for providing expanded telecommunications service

14. 8774785 - Methods and systems for blocking unwanted communications

15. 8750469 - Methods and systems for call processing

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as of
12/12/2025
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