Growing community of inventors

Round Lake, IL, United States of America

Douglas Marshall

Average Co-Inventor Count = 5.66

ph-index = 3

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 = 73

Douglas MarshallCarol Shifrin Gruchala (5 patents)Douglas MarshallGordon Lynn Blumenschein (5 patents)Douglas MarshallCarlos H Donoso (4 patents)Douglas MarshallRoger Albert Sosa (4 patents)Douglas MarshallThomas Joseph McBlain (1 patent)Douglas MarshallJohn Wesley Moss (1 patent)Douglas MarshallSusanne Marie Crockett (1 patent)Douglas MarshallNancy Ann Book (1 patent)Douglas MarshallDianna Inara Tiliks (1 patent)Douglas MarshallJames Daniel Kovarik (1 patent)Douglas MarshallBarbara Jablonski (1 patent)Douglas MarshallJayson Anthony O'Neill (1 patent)Douglas MarshallMatthew D Brooks (1 patent)Douglas MarshallDouglas Marshall (5 patents)Carol Shifrin GruchalaCarol Shifrin Gruchala (61 patents)Gordon Lynn BlumenscheinGordon Lynn Blumenschein (36 patents)Carlos H DonosoCarlos H Donoso (19 patents)Roger Albert SosaRoger Albert Sosa (4 patents)Thomas Joseph McBlainThomas Joseph McBlain (67 patents)John Wesley MossJohn Wesley Moss (67 patents)Susanne Marie CrockettSusanne Marie Crockett (63 patents)Nancy Ann BookNancy Ann Book (60 patents)Dianna Inara TiliksDianna Inara Tiliks (51 patents)James Daniel KovarikJames Daniel Kovarik (22 patents)Barbara JablonskiBarbara Jablonski (1 patent)Jayson Anthony O'NeillJayson Anthony O'Neill (1 patent)Matthew D BrooksMatthew D Brooks (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Ameritech Corporation (2 from 159 patents)

2. At&t Intellectual Property I, LP (1 from 16,507 patents)

3. Sbc Properties, L.p. (1 from 205 patents)

4. At&t Knowledge Ventures, LP (1 from 75 patents)


5 patents:

1. 8036354 - Calling-party-pays call processing for cellular and paging

2. 7366292 - Call management reports

3. 7257209 - Calling-party-pays call processing for cellular and paging

4. 6570970 - Calling-party-pays call processing for cellular and paging

5. 6263056 - Calling-party-pays call processing for cellular and paging

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as of
1/10/2026
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