Technique for obtaining caller-originated alert signals in IP-based communication sessions
US-9781257-B2 · Oct 3, 2017 · US
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Liu Charles patents in 2017
Liu Charles was listed as an assignee on 1 patent publication in 2017.
| Metric | Value |
|---|---|
| Company | Liu Charles |
| Year | 2017 |
| Patents | 1 |
Patents
Representative publications for Liu Charles in 2017.
Top CPC classifications
Most common classification codes for Liu Charles in 2017.
| CPC | Patents |
|---|---|
| H04M2203/654 | 1 |
| H04M3/02 | 1 |
| H04M3/42093 | 1 |
| H04M3/42102 | 1 |
| H04M3/5322 | 1 |
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