Growing community of inventors

Whitby, Canada

David Edward Johnston

Average Co-Inventor Count = 3.00

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 = 45

David Edward JohnstonL Lloyd Williams (3 patents)David Edward JohnstonAlexander Markman (3 patents)David Edward JohnstonDavid William Clark (2 patents)David Edward JohnstonSean MacLean Murray (1 patent)David Edward JohnstonWilliam Barry Crago (1 patent)David Edward JohnstonWilliam B Crago (1 patent)David Edward JohnstonGregory A Lam (1 patent)David Edward JohnstonDavid Edward Johnston (5 patents)L Lloyd WilliamsL Lloyd Williams (23 patents)Alexander MarkmanAlexander Markman (5 patents)David William ClarkDavid William Clark (35 patents)Sean MacLean MurraySean MacLean Murray (39 patents)William Barry CragoWilliam Barry Crago (9 patents)William B CragoWilliam B Crago (1 patent)Gregory A LamGregory A Lam (1 patent)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Bce Inc. (2 from 187 patents)

2. Newstep Networks Inc. (2 from 4 patents)

3. Revd Networks, Inc. (1 from 1 patent)

4. Bell Canada (32 patents)


5 patents:

1. 7864930 - Systems and methods for registration and retrieval of voice mail contact information

2. 7587033 - Methods and systems for rendering voice mail messages amenable to electronic processing by mailbox owners

3. 6839422 - Method and apparatus for providing local call treatment discrimination for selected calls on a switched telephone network

4. 6766009 - Method and system for correlating telephone calls with information delivery

5. 6724876 - Method and apparatus for effecting telecommunications service features using call control information extracted from a bearer channel in a telecommunications network

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as of
12/30/2025
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